back·room 
(băkrm, -rm)
(băkrm, -rm)n. or back room
1. A room located at the rear.
2. The meeting place used by an inconspicuous controlling group.
adj.
1. Of, relating to, or taking place in a backroom: backroom card games.
2. Marked by the exercise of inconspicuous control and maneuvering: backroom politics.