public function getMembers($groupIdentifier, $serviceProviderGroupAcls)
 {
     $members = array();
     $stemmedGroupIdentifier = $this->_getStemmedGroupId($groupIdentifier);
     $subjects = $this->_grouperClient->getMembersWithPrivileges($stemmedGroupIdentifier);
     foreach ($subjects as $subject) {
         $members[] = $this->_mapGrouperSubjectToEngineBlockGroupMember($subject, $stemmedGroupIdentifier);
     }
     return $members;
 }