The Goatee Men
Only one of the GM has been identified by name:  Steven.  Since reviewing past mission tapes, it has been found that these two have been monitoring Nikita since the take over attempt by Petrosian (See Coup Attempt).  Steven had posed as Carla's boyfriend to gain access to Nikita.  Why these two were never noticed by either Nikita or Michael is not known (although it has been alluded to that Nikita may have known of their presence since she was involved in the take down of Adrian).
 

                                                                                                        Carla
It is now apparent that Carla was put in place by Adrian to determine whether or not Nikita was the accomplice that she was looking for.  This leads Psych Ops to believe that Adrian had another operative in place in Section prior to Nikita's entrance (Jurgen has been mentioned as a possibility given that he seemed to know of Carla's whereabouts after Nikita's return).  During Nikita's Post Training Year (PTY), she provided the allusion of normalcy to Nikita's rather unusual life.
 

Cell 14