diff --git a/client/angular.json b/client/angular.json
index 445c723da6..c00b3a0ccd 100644
--- a/client/angular.json
+++ b/client/angular.json
@@ -55,7 +55,7 @@
                                 {
                                     "type": "initial",
                                     "maximumWarning": "1500kb",
-                                    "maximumError": "3mb"
+                                    "maximumError": "3500kb"
                                 },
                                 {
                                     "type": "anyComponentStyle",
diff --git a/client/src/app/domain/models/poll/poll-constants.ts b/client/src/app/domain/models/poll/poll-constants.ts
index 7e7e4ff86f..053e695478 100644
--- a/client/src/app/domain/models/poll/poll-constants.ts
+++ b/client/src/app/domain/models/poll/poll-constants.ts
@@ -102,6 +102,8 @@ export interface EntitledUsersEntry {
     present: boolean;
     voted: boolean;
     vote_delegated_to_user_id?: number;
+    user_merged_into_id?: number;
+    delegation_user_merged_into_id?: number;
 }
 
 export const VOTE_MAJORITY = -1;
diff --git a/client/src/app/gateways/presenter/history-presenter.service.ts b/client/src/app/gateways/presenter/history-presenter.service.ts
index 69ea7769ce..9f6930a141 100644
--- a/client/src/app/gateways/presenter/history-presenter.service.ts
+++ b/client/src/app/gateways/presenter/history-presenter.service.ts
@@ -70,13 +70,14 @@ export class HistoryPresenterService {
             .flatMap(positions => getUniqueItems(positions))
             .sort((positionA, positionB) => positionB.timestamp - positionA.timestamp)
             .map(position => {
+                const userView = this.userRepo.getViewModel(position.user_id);
                 return new HistoryPosition({
                     ...position,
                     information: Array.isArray(position.information)
                         ? position.information
                         : position?.information[fqid],
                     fqid,
-                    user: this.userRepo.getViewModel(position.user_id)?.getFullName()
+                    user: userView?.getFullName() ? userView.getFullName() : `user/${position.user_id}`
                 });
             });
     }
diff --git a/client/src/app/gateways/repositories/users/user-repository.service.ts b/client/src/app/gateways/repositories/users/user-repository.service.ts
index 413bce9313..a27bcd93c1 100644
--- a/client/src/app/gateways/repositories/users/user-repository.service.ts
+++ b/client/src/app/gateways/repositories/users/user-repository.service.ts
@@ -508,6 +508,10 @@ export class UserRepositoryService extends BaseRepository<ViewUser, User> {
         return this.createAction<BackendImportRawPreview | void>(UserAction.PARTICIPANT_IMPORT, payload);
     }
 
+    public mergeTogether(payload: { id: number; user_ids: number[] }[]): Action<void> {
+        return this.createAction(UserAction.MERGE_TOGETHER, payload);
+    }
+
     private sanitizePayload(payload: any): any {
         const temp = { ...payload };
         for (const key of Object.keys(temp).filter(field => !this.isFieldAllowedToBeEmpty(field))) {
diff --git a/client/src/app/site/pages/meetings/modules/poll/base/base-poll-detail.component.ts b/client/src/app/site/pages/meetings/modules/poll/base/base-poll-detail.component.ts
index d0ad1600df..8ecf46cdbe 100644
--- a/client/src/app/site/pages/meetings/modules/poll/base/base-poll-detail.component.ts
+++ b/client/src/app/site/pages/meetings/modules/poll/base/base-poll-detail.component.ts
@@ -230,6 +230,12 @@ export abstract class BasePollDetailComponent<V extends PollContentObject, S ext
             if (entry.vote_delegated_to_user_id) {
                 userIds.add(entry.vote_delegated_to_user_id);
             }
+            if (entry.user_merged_into_id) {
+                userIds.add(entry.user_merged_into_id);
+            }
+            if (entry.delegation_user_merged_into_id) {
+                userIds.add(entry.delegation_user_merged_into_id);
+            }
         }
         this.subscriptions.push(
             (this.entitledUsersSubscription = this.userRepo
@@ -248,6 +254,16 @@ export abstract class BasePollDetailComponent<V extends PollContentObject, S ext
                             voted_verbose: `voted:${entry.voted}`,
                             vote_delegated_to: entry.vote_delegated_to_user_id
                                 ? users.find(user => user.id === entry.vote_delegated_to_user_id)
+                                : null,
+                            user_merged_into: entry.user_merged_into_id
+                                ? `${this.translate.instant(`Old account of`)} ${users
+                                      .find(user => user.id === entry.user_merged_into_id)
+                                      ?.getShortName()}`
+                                : null,
+                            delegation_user_merged_into: entry.delegation_user_merged_into_id
+                                ? `(${this.translate.instant(`represented by old account of`)}) ${users
+                                      .find(user => user.id === entry.delegation_user_merged_into_id)
+                                      ?.getShortName()}`
                                 : null
                         });
                     }
diff --git a/client/src/app/site/pages/meetings/modules/poll/base/base-poll-pdf.service.ts b/client/src/app/site/pages/meetings/modules/poll/base/base-poll-pdf.service.ts
index 3941ba1f23..9fd2c350f3 100644
--- a/client/src/app/site/pages/meetings/modules/poll/base/base-poll-pdf.service.ts
+++ b/client/src/app/site/pages/meetings/modules/poll/base/base-poll-pdf.service.ts
@@ -626,17 +626,26 @@ export abstract class BasePollPdfService {
         for (const date of usersData.sort((entryA, entryB) =>
             entryA.user?.getName().localeCompare(entryB.user?.getName())
         )) {
+            const name = date.user_merged_into_id
+                ? `${this.translate.instant(`Old account of`)} ` +
+                  this.getUserNameForExport(this.userRepo.getViewModel(date.user_merged_into_id))
+                : this.getUserNameForExport(date.user);
+            let represented = ``;
+            if (date.vote_delegated_to_user_id && !date.delegation_user_merged_into_id) {
+                represented =
+                    `\n${this.translate.instant(`represented by`)} ` +
+                    this.getUserNameForExport(date.vote_delegated_to);
+            } else if (date.vote_delegated_to_user_id && date.delegation_user_merged_into_id) {
+                represented =
+                    `\n${this.translate.instant(`represented by old account of`)} ` +
+                    this.getUserNameForExport(this.userRepo.getViewModel(date.delegation_user_merged_into_id));
+            }
             const tableLine = [
                 {
                     text: index
                 },
                 {
-                    text:
-                        this.getUserNameForExport(date.user) +
-                        (date.vote_delegated_to
-                            ? `\n${this.translate.instant(`represented by`)} ` +
-                              this.getUserNameForExport(date.vote_delegated_to)
-                            : ``)
+                    text: name + represented
                 },
                 {
                     text: this.translate.instant(date.voted ? `Yes` : `No`)
diff --git a/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.html b/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.html
index 6fd5d1f1ef..be1e42a874 100644
--- a/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.html
+++ b/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.html
@@ -18,14 +18,35 @@
                         </div>
 
                         <!-- Delegation -->
-                        <div *ngIf="entry.vote_delegated_to_user_id">
+                        <div *ngIf="entry.vote_delegated_to_user_id && !entry.delegation_user_merged_into_id">
                             <span>
-                                ({{ 'represented by' | translate }} {{ entry.vote_delegated_to.getShortName().trim() }})
+                                ({{ 'represented by' | translate }} {{ entry.vote_delegated_to.getShortName() }})
+                            </span>
+                        </div>
+                        <div *ngIf="entry.vote_delegated_to_user_id && entry.delegation_user_merged_into_id">
+                            <span>
+                                {{ entry.delegation_user_merged_into }}
+                            </span>
+                        </div>
+                    </div>
+                </div>
+                <div *ngIf="!entry.user && entry.user_merged_into_id">
+                    {{ entry.user_merged_into }}
+                    <div class="user-subtitle">
+                        <!-- Delegation -->
+                        <div *ngIf="entry.vote_delegated_to_user_id && !entry.delegation_user_merged_into_id">
+                            <span>
+                                ({{ 'represented by' | translate }} {{ entry.vote_delegated_to?.getShortName() }})
+                            </span>
+                        </div>
+                        <div *ngIf="entry.vote_delegated_to_user_id && entry.delegation_user_merged_into_id">
+                            <span>
+                                {{ entry.delegation_user_merged_into }}
                             </span>
                         </div>
                     </div>
                 </div>
-                <i *ngIf="!entry.user">{{ 'Anonymous' | translate }}</i>
+                <i *ngIf="!entry.user && !entry.user_merged_into_id">{{ 'Anonymous' | translate }}</i>
             </div>
             <div *osScrollingTableCell="'present'; row as entry; config: { width: 24 }">
                 <div *osScrollingTableCellLabel>{{ 'Is present' | translate }}</div>
diff --git a/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.ts b/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.ts
index eb4d01173b..3b2652615c 100644
--- a/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.ts
+++ b/client/src/app/site/pages/meetings/modules/poll/components/entitled-users-table/entitled-users-table.component.ts
@@ -44,7 +44,14 @@ export class EntitledUsersTableComponent {
 
     public readonly permission = Permission;
 
-    public filterPropsEntitledUsersTable = [`user.full_name`, `vote_delegated_to.full_name`, `voted_verbose`];
+    public filterPropsEntitledUsersTable = [
+        `user.full_name`,
+        `vote_delegated_to.full_name`,
+        `user_merged_into`,
+        `delegation_user_merged_into`,
+        `voted_verbose`
+    ];
+
     public constructor(
         private controller: ParticipantControllerService,
         public filter: EntitledUsersListFilterService
diff --git a/client/src/app/site/pages/meetings/modules/poll/definitions/entitled-users-table-entry.ts b/client/src/app/site/pages/meetings/modules/poll/definitions/entitled-users-table-entry.ts
index f4a894254c..e40b09d33d 100644
--- a/client/src/app/site/pages/meetings/modules/poll/definitions/entitled-users-table-entry.ts
+++ b/client/src/app/site/pages/meetings/modules/poll/definitions/entitled-users-table-entry.ts
@@ -6,4 +6,6 @@ export interface EntitledUsersTableEntry extends EntitledUsersEntry, Identifiabl
     user?: ViewUser;
     voted_verbose: string;
     vote_delegated_to?: ViewUser | null;
+    user_merged_into?: string | null;
+    delegation_user_merged_into?: string | null;
 }
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/account-list.module.ts b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/account-list.module.ts
index f2f480f38f..517c2dfd18 100644
--- a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/account-list.module.ts
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/account-list.module.ts
@@ -1,10 +1,13 @@
 import { CommonModule } from '@angular/common';
 import { NgModule } from '@angular/core';
+import { MatDialogModule } from '@angular/material/dialog';
 import { MatDividerModule } from '@angular/material/divider';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatIconModule } from '@angular/material/icon';
 import { MatLegacyButtonModule as MatButtonModule } from '@angular/material/legacy-button';
 import { MatLegacyMenuModule as MatMenuModule } from '@angular/material/legacy-menu';
+import { MatRadioModule } from '@angular/material/radio';
+import { MatTableModule } from '@angular/material/table';
 import { MatTooltipModule } from '@angular/material/tooltip';
 import { RouterModule } from '@angular/router';
 import { OpenSlidesTranslationModule } from 'src/app/site/modules/translations';
@@ -22,10 +25,11 @@ import { AccountCommonServiceModule } from '../../services/common/account-common
 import { AccountListRoutingModule } from './account-list-routing.module';
 import { AccountListComponent } from './components/account-list/account-list.component';
 import { AccountListMainComponent } from './components/account-list-main/account-list-main.component';
+import { AccountMergeDialogComponent } from './components/account-merge-dialog/account-merge-dialog.component';
 import { AccountListServiceModule } from './services/account-list-service.module';
 
 @NgModule({
-    declarations: [AccountListComponent, AccountListMainComponent],
+    declarations: [AccountListComponent, AccountListMainComponent, AccountMergeDialogComponent],
     imports: [
         CommonModule,
         AccountListRoutingModule,
@@ -47,7 +51,10 @@ import { AccountListServiceModule } from './services/account-list-service.module
         MatFormFieldModule,
         IconContainerModule,
         RouterModule,
-        PipesModule
+        PipesModule,
+        MatDialogModule,
+        MatRadioModule,
+        MatTableModule
     ]
 })
 export class AccountListModule {}
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.html b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.html
index 896896eb37..cbc4eae45c 100644
--- a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.html
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.html
@@ -177,6 +177,10 @@ <h2>
                 <mat-icon>block</mat-icon>
                 <span>{{ 'Enable/disable accounts' | translate }} ...</span>
             </button>
+            <button mat-menu-item [disabled]="selectedRows.length < 2" (click)="mergeUsersTogether()">
+                <mat-icon>merge</mat-icon>
+                <span>{{ 'Merge users together' | translate }} ...</span>
+            </button>
         </os-user-multiselect-actions>
     </div>
 </mat-menu>
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.ts b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.ts
index 613f80b9b0..038e151532 100644
--- a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.ts
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-list/account-list.component.ts
@@ -1,10 +1,13 @@
 import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { MatDialog } from '@angular/material/dialog';
 import { ActivatedRoute } from '@angular/router';
 import { marker as _ } from '@colsen1991/ngx-translate-extract-marker';
 import { TranslateService } from '@ngx-translate/core';
+import { firstValueFrom } from 'rxjs';
 import { Observable } from 'rxjs';
 import { getOmlVerboseName } from 'src/app/domain/definitions/organization-permission';
 import { OMLMapping } from 'src/app/domain/definitions/organization-permission';
+import { mediumDialogSettings } from 'src/app/infrastructure/utils/dialog-settings';
 import { BaseListViewComponent } from 'src/app/site/base/base-list-view.component';
 import { MeetingControllerService } from 'src/app/site/pages/meetings/services/meeting-controller.service';
 import { ViewMeeting } from 'src/app/site/pages/meetings/view-models/view-meeting';
@@ -19,6 +22,7 @@ import { AccountControllerService } from '../../../../services/common/account-co
 import { AccountFilterService } from '../../../../services/common/account-filter.service';
 import { AccountListSearchService } from '../../services/account-list-search/account-list-search.service';
 import { AccountSortService } from '../../services/account-list-sort.service/account-sort.service';
+import { AccountMergeDialogComponent } from '../account-merge-dialog/account-merge-dialog.component';
 
 const ACCOUNT_LIST_STORAGE_INDEX = `account_list`;
 
@@ -47,7 +51,8 @@ export class AccountListComponent extends BaseListViewComponent<ViewUser> {
         private userController: UserControllerService,
         public searchService: AccountListSearchService,
         private operator: OperatorService,
-        private vp: ViewPortService
+        private vp: ViewPortService,
+        private dialog: MatDialog
     ) {
         super();
         super.setTitle(`Accounts`);
@@ -126,4 +131,22 @@ export class AccountListComponent extends BaseListViewComponent<ViewUser> {
     public getOmlByUser(user: ViewUser): string {
         return getOmlVerboseName(user.organization_management_level as keyof OMLMapping);
     }
+
+    public async mergeUsersTogether(): Promise<void> {
+        const result = await this.openMergeDialog();
+        if (result) {
+            const id = result;
+            const user_ids = this.selectedRows.map(view => view.id).filter(sRid => sRid !== id);
+            this.controller.mergeTogether([{ id: id, user_ids: user_ids }]).resolve();
+        }
+    }
+
+    public async openMergeDialog(): Promise<number | null> {
+        const data = { choices: this.selectedRows };
+        const dialogRef = this.dialog.open(AccountMergeDialogComponent, {
+            ...mediumDialogSettings,
+            data: data
+        });
+        return firstValueFrom(dialogRef.afterClosed());
+    }
 }
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.html b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.html
new file mode 100644
index 0000000000..394905c47e
--- /dev/null
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.html
@@ -0,0 +1,104 @@
+<div mat-dialog-title>{{ 'Merge users' | translate }}</div>
+<mat-dialog-content>
+    <div>{{ 'Please select a primary account.' | translate }}</div>
+    <mat-radio-group (change)="onChange($event)">
+        <table mat-table [dataSource]="possibleChoices">
+            <ng-container matColumnDef="button">
+                <td mat-cell *matCellDef="let user">
+                    <div class="buttonCell"><mat-radio-button [value]="user.id"></mat-radio-button></div>
+                </td>
+            </ng-container>
+
+            <ng-container matColumnDef="name">
+                <td mat-cell *matCellDef="let user">
+                    <div class="nameCell overflow-hidden">
+                        <div class="title-line title-box">
+                            <div *ngIf="!isCrossedOut(user)">
+                                <span class="ellipsis-overflow">{{ user.short_name }}</span>
+                                <span class="meta-info user-subtitle" *ngIf="!!user.gender">
+                                    &middot;&nbsp;{{ user.gender }}
+                                </span>
+                                <span class="meta-info user-subtitle" *ngIf="!!user.pronoun">
+                                    &middot;&nbsp;{{ user.pronoun }}
+                                </span>
+                            </div>
+                            <div *ngIf="isCrossedOut(user)">
+                                <span class="ellipsis-overflow crossed-out">{{ user.short_name }}</span>
+                                <span class="meta-info user-subtitle" *ngIf="!!user.gender">
+                                    &middot;&nbsp;{{ user.gender }}
+                                </span>
+                                <span class="meta-info user-subtitle" *ngIf="!!user.pronoun">
+                                    &middot;&nbsp;{{ user.pronoun }}
+                                </span>
+                            </div>
+                            <div style="float: right; display: inline-flex">
+                                &nbsp;
+                                <os-icon-container
+                                    icon="account_balance"
+                                    *ngIf="!user.is_physical_person"
+                                    matTooltip="{{ 'Is no natural person' | translate }}"
+                                ></os-icon-container>
+                                <os-icon-container
+                                    icon="block"
+                                    *ngIf="!user.is_active"
+                                    matTooltip="{{ 'Inactive' | translate }}"
+                                ></os-icon-container>
+                                <os-icon-container
+                                    icon="fingerprint"
+                                    *ngIf="user.hasSamlId"
+                                    matTooltip="{{ 'Has SSO identification' | translate }}"
+                                ></os-icon-container>
+                            </div>
+                        </div>
+                        <div class="meta-info user-subtitle ellipsis-overflow">
+                            {{ user.saml_id || user.username }}
+                            <ng-container *ngIf="user.email">&middot; {{ user.email }}&nbsp;</ng-container>
+                            <ng-container *ngIf="user.member_number">&middot; {{ user.member_number }}</ng-container>
+                        </div>
+                        <div class="meta-info user-subtitle ellipsis-overflow" *ngIf="user?.isLastLogin">
+                            {{ 'Last login' | translate }} {{ user.last_login | localizedDate }}
+                        </div>
+                    </div>
+                </td>
+            </ng-container>
+
+            <ng-container matColumnDef="icon">
+                <td mat-cell *matCellDef="let user">
+                    <div class="iconCell">
+                        <os-icon-container
+                            icon="event_available"
+                            [iconTooltip]="userMeetings(user)"
+                            iconTooltipPosition="left"
+                            iconTooltipClass="pre-wrap"
+                            [showIcon]="true"
+                            [noWrap]="true"
+                        >
+                            {{ user.meetings.length }}
+                        </os-icon-container>
+                        <os-icon-container
+                            icon="mail"
+                            *ngIf="user.isLastEmailSent"
+                            iconTooltip="{{ 'Email sent' | translate }} ({{ user.last_email_sent | localizedDate }})"
+                            iconTooltipPosition="left"
+                        ></os-icon-container>
+                    </div>
+                </td>
+            </ng-container>
+            <tr mat-row *matRowDef="let row; columns: displayedColumns"></tr>
+        </table>
+    </mat-radio-group>
+    <div class="error-color">{{ 'Attention: Not selected accounts will be merged and then deleted.' | translate }}</div>
+    <div class="error-color" *ngIf="showMeetingsCollide">
+        {{ 'Warning: Data loss is possible, because two users are in the same meeting.' | translate }}
+        {{ 'Meetings effected:' | translate }}
+        {{ countMeetingsCollide }}
+    </div>
+</mat-dialog-content>
+<mat-dialog-actions>
+    <button mat-button (click)="closeDialog(true)" [disabled]="!selectedUserId">
+        <span>{{ 'Merge' | translate }}</span>
+    </button>
+    <button mat-button (click)="closeDialog(false)">
+        <span>{{ 'Cancel' | translate }}</span>
+    </button>
+</mat-dialog-actions>
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.scss b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.scss
new file mode 100644
index 0000000000..c7ce3aa5ce
--- /dev/null
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.scss
@@ -0,0 +1,27 @@
+.error-color {
+    color: red;
+}
+
+.mat-column-button {
+    width: 60px;
+}
+
+.nameCell {
+    display: flex;
+    flex-direction: column;
+    flex-basis: 620px;
+}
+
+.iconCell {
+    display: flex;
+    flex-direction: column;
+    flex-basis: 100px;
+}
+
+.meta-info {
+    font-size: 12px;
+}
+
+.crossed-out {
+    text-decoration: line-through;
+}
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.spec.ts b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.spec.ts
new file mode 100644
index 0000000000..83abcb8dc6
--- /dev/null
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.spec.ts
@@ -0,0 +1,21 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { AccountMergeDialogComponent } from './account-merge-dialog.component';
+
+xdescribe(`AccountMergeDialogComponent`, () => {
+    let component: AccountMergeDialogComponent;
+    let fixture: ComponentFixture<AccountMergeDialogComponent>;
+
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            declarations: [AccountMergeDialogComponent]
+        });
+        fixture = TestBed.createComponent(AccountMergeDialogComponent);
+        component = fixture.componentInstance;
+        fixture.detectChanges();
+    });
+
+    it(`should create`, () => {
+        expect(component).toBeTruthy();
+    });
+});
diff --git a/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.ts b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.ts
new file mode 100644
index 0000000000..1f8bf407e9
--- /dev/null
+++ b/client/src/app/site/pages/organization/pages/accounts/pages/account-list/components/account-merge-dialog/account-merge-dialog.component.ts
@@ -0,0 +1,76 @@
+import { ChangeDetectionStrategy, Component, Inject } from '@angular/core';
+import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
+import { ViewUser } from 'src/app/site/pages/meetings/view-models/view-user';
+
+export type AccountMergeDialogData = { choices: ViewUser[] };
+export type AccountMergeDialogAnswer = number | null;
+
+@Component({
+    selector: `os-account-merge-dialog`,
+    templateUrl: `./account-merge-dialog.component.html`,
+    styleUrls: [`./account-merge-dialog.component.scss`],
+    changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class AccountMergeDialogComponent {
+    public constructor(
+        public dialogRef: MatDialogRef<AccountMergeDialogComponent, AccountMergeDialogAnswer>,
+        @Inject(MAT_DIALOG_DATA) public data: AccountMergeDialogData
+    ) {
+        this.data.choices.sort((a, b) => a.name.localeCompare(b.name));
+        const meetingIdsVisited: number[] = [];
+
+        for (const user of this.data.choices) {
+            for (const meeting of user.meetings) {
+                if (meetingIdsVisited.includes(meeting.id)) {
+                    this._meetingsCollide.add(meeting.id);
+                }
+                meetingIdsVisited.push(meeting.id);
+            }
+        }
+    }
+
+    public selectedUserId: number;
+    public displayedColumns = [`button`, `name`, `icon`];
+    private _meetingsCollide = new Set<number>();
+
+    public get showMeetingsCollide(): boolean {
+        return this._meetingsCollide.size > 0;
+    }
+
+    public get countMeetingsCollide(): number {
+        return this._meetingsCollide.size;
+    }
+
+    public get possibleChoices(): ViewUser[] {
+        return this.data.choices;
+    }
+
+    public userMeetings(user: ViewUser): string {
+        if (user.meetings.length > 10) {
+            const res = user.meetings.map(a => a.name).slice(0, 10);
+            res.push(`...`);
+            return res.join(`\n`);
+        } else {
+            return user.meetings.map(a => a.name).join(`\n`);
+        }
+    }
+
+    public isCrossedOut(user: ViewUser): boolean {
+        if (!this.selectedUserId) {
+            return false;
+        }
+        return this.selectedUserId !== user.id;
+    }
+
+    public onChange(event): void {
+        this.selectedUserId = Number.parseInt(event.value);
+    }
+
+    protected closeDialog(ok: boolean): void {
+        if (ok && this.selectedUserId) {
+            this.dialogRef.close(this.selectedUserId);
+        } else {
+            this.dialogRef.close(null);
+        }
+    }
+}
diff --git a/client/src/app/site/pages/organization/pages/accounts/services/common/account-controller.service.ts b/client/src/app/site/pages/organization/pages/accounts/services/common/account-controller.service.ts
index 42d6228b9d..a388837c3c 100644
--- a/client/src/app/site/pages/organization/pages/accounts/services/common/account-controller.service.ts
+++ b/client/src/app/site/pages/organization/pages/accounts/services/common/account-controller.service.ts
@@ -96,4 +96,8 @@ export class AccountControllerService extends BaseController<ViewUser, User> {
     public import(payload: { id: number; import: boolean }[]): Action<BackendImportRawPreview | void> {
         return this.repo.accountImport(payload);
     }
+
+    public mergeTogether(payload: { id: number; user_ids: number[] }[]): Action<void> {
+        return this.repo.mergeTogether(payload);
+    }
 }
diff --git a/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.html b/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.html
index 827804fa26..d7bd884818 100644
--- a/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.html
+++ b/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.html
@@ -17,6 +17,7 @@
         [inline]="inline"
         [matTooltip]="iconTooltip"
         [matTooltipPosition]="iconTooltipPosition"
+        [matTooltipClass]="iconTooltipClass"
         [ngClass]="{ pointer: iconAction, mirrored: mirrored }"
         [ngStyle]="{ transform: getRotation() }"
         (click)="iconClick()"
diff --git a/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.ts b/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.ts
index 4ac6185de4..04d0ace021 100644
--- a/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.ts
+++ b/client/src/app/ui/modules/icon-container/components/icon-container/icon-container.component.ts
@@ -73,6 +73,12 @@ export class IconContainerComponent {
     @Input()
     public iconTooltipPosition: TooltipPosition = `below`;
 
+    /**
+     * Optional string for tooltip class
+     */
+    @Input()
+    public iconTooltipClass = ``;
+
     /**
      * Uses a css class for nowrap
      */