diff --git a/DigitalData.UserManager.Domain/Entities/GroupOfUser.cs b/DigitalData.UserManager.Domain/Entities/GroupOfUser.cs
index 82e3f64..0a92529 100644
--- a/DigitalData.UserManager.Domain/Entities/GroupOfUser.cs
+++ b/DigitalData.UserManager.Domain/Entities/GroupOfUser.cs
@@ -1,5 +1,4 @@
-using System.ComponentModel;
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 
 namespace DigitalData.UserManager.Domain.Entities
diff --git a/DigitalData.UserManager.Infrastructure/Contracts/IGroupOfUserRepository.cs b/DigitalData.UserManager.Infrastructure/Contracts/IGroupOfUserRepository.cs
index 175d745..49d07b5 100644
--- a/DigitalData.UserManager.Infrastructure/Contracts/IGroupOfUserRepository.cs
+++ b/DigitalData.UserManager.Infrastructure/Contracts/IGroupOfUserRepository.cs
@@ -18,5 +18,11 @@ namespace DigitalData.UserManager.Infrastructure.Contracts
         Task<IEnumerable<GroupOfUser>> ReadByUsernameAsync(string username);
 
         Task<IEnumerable<GroupOfUser>> ReadByUserIdAsync(int userId);
+
+        // merge all GroupOfUserRepository-methods conditionally under this method
+        Task<IEnumerable<GroupOfUser>> ReadAsync(
+            bool readOnly = true,
+            bool withGroup = true, bool withUser = true,
+            int? id = null, int? groupId = null, int? userId = null, string? username = null);
     }
 }
\ No newline at end of file
diff --git a/DigitalData.UserManager.Infrastructure/Repositories/GroupOfUserRepository.cs b/DigitalData.UserManager.Infrastructure/Repositories/GroupOfUserRepository.cs
index 313b965..a49e728 100644
--- a/DigitalData.UserManager.Infrastructure/Repositories/GroupOfUserRepository.cs
+++ b/DigitalData.UserManager.Infrastructure/Repositories/GroupOfUserRepository.cs
@@ -42,5 +42,33 @@ namespace DigitalData.UserManager.Infrastructure.Repositories
         public async Task<IEnumerable<GroupOfUser>> ReadByUsernameAsync(string username) => await ReadByUsername(username).ToListAsync();
 
         public async Task<IEnumerable<GroupOfUser>> ReadByUserIdAsync(int userId) => await ReadByUserId(userId).ToListAsync();
+
+        public async Task<IEnumerable<GroupOfUser>> ReadAsync(
+            bool readOnly = true,
+            bool withGroup = true, bool withUser = true,
+            int? id = null, int? groupId = null, int? userId = null, string? username = null)
+        {
+            var query = readOnly ? _dbSet.AsNoTracking() : _dbSet.AsQueryable();
+
+            if (withGroup)
+                query = query.Include(gou => gou.Group);
+
+            if (withUser)
+                query = query.Include(gou => gou.User);
+
+            if (id is not null)
+                query = query.Where(gou => gou.Id == id);
+
+            if (groupId is not null)
+                query = query.Where(gou => gou.GroupId == groupId);
+
+            if (userId is not null)
+                query = query.Where(gou => gou.UserId == userId);
+
+            if (username is not null)
+                query = query.Where(gou => gou.User!.Username == username);
+
+            return await query.ToListAsync();
+        }
     }
 }
\ No newline at end of file
diff --git a/DigitalData.UserManager.Infrastructure/Repositories/UserRepository.cs b/DigitalData.UserManager.Infrastructure/Repositories/UserRepository.cs
index f5f82d2..e5bab86 100644
--- a/DigitalData.UserManager.Infrastructure/Repositories/UserRepository.cs
+++ b/DigitalData.UserManager.Infrastructure/Repositories/UserRepository.cs
@@ -8,8 +8,8 @@ namespace DigitalData.UserManager.Infrastructure.Repositories
     public class UserRepository<TDbContext> : CRUDRepository<User, int, TDbContext>, IUserRepository
         where TDbContext : DbContext, IUserManagerDbContext
     {
-        private IModuleOfUserRepository _moduleOfUserRepo;
-        private IGroupOfUserRepository _groupOfUserRepo;
+        private readonly IModuleOfUserRepository _moduleOfUserRepo;
+        private readonly IGroupOfUserRepository _groupOfUserRepo;
         public UserRepository(TDbContext dbContext, IModuleOfUserRepository moduleOfUserRepo, IGroupOfUserRepository groupOfUserRepo) : base(dbContext, dbContext.Users)
         {
             _moduleOfUserRepo = moduleOfUserRepo;