diff --git a/Project/php/gateway/GroupGateway.php b/Project/php/gateway/GroupGateway.php
index a96f4d3..bc9affc 100755
--- a/Project/php/gateway/GroupGateway.php
+++ b/Project/php/gateway/GroupGateway.php
@@ -4,6 +4,8 @@ namespace gateway;
 
 use PDO;
 use PDOException;
+use config\Connection;
+use model\Group;
 
 class GroupGateway extends AbsGateway
 {
@@ -27,7 +29,7 @@ class GroupGateway extends AbsGateway
         }
     }
 
-    public function remove(array $id): void
+    public function remove(int $id): void
     {
         try{
             $query = "DELETE FROM Group_ g WHERE g.id=:id ";
diff --git a/Project/php/gateway/UserGateway.php b/Project/php/gateway/UserGateway.php
index c16baa8..b08fdec 100755
--- a/Project/php/gateway/UserGateway.php
+++ b/Project/php/gateway/UserGateway.php
@@ -261,4 +261,20 @@ class UserGateway extends AbsGateway
             throw new Exception($e->getMessage());
         }
     }
+
+    public function findUsersByGroup(int $id): array {
+        try {
+            $query = "SELECT * FROM User_ WHERE groupID=:group";
+            $args = array(':group' => array($id, PDO::PARAM_INT));
+            $this->con->executeQuery($query, $args);
+            $results = $this->con->getResults();
+            $tab = array();
+            foreach ($results as $row)
+                $tab[] = new User($row['id'], $row['password'], $row['email'], $row['name'], $row['surname'], $row['nickname'], $row['image'], $row['extraTime'], $row['groupID'], $this->getRoles($row['id']));
+            return $tab;
+        }
+        catch(PDOException $e ){
+            throw new Exception($e->getMessage());
+        }
+    }
 }
\ No newline at end of file
diff --git a/Project/php/gateway/VocabularyGateway.php b/Project/php/gateway/VocabularyGateway.php
index 1120b97..4aee47e 100755
--- a/Project/php/gateway/VocabularyGateway.php
+++ b/Project/php/gateway/VocabularyGateway.php
@@ -28,7 +28,7 @@ class VocabularyGateway extends AbsGateway
         }
     }
 
-    public function remove(array $id): void
+    public function remove(int $id): void
     {
         try{
             $query = "DELETE FROM Vocabulary v WHERE v.id=:id ";