If you were to ask Acumen, he is the one in charge. However, there was another AI before Acumen and obviously both were created by someone. There is a Defense Force to protect the inmates and respond to issues if you were to think of a more direct source aside from Acumen. There are also 'cliques' as you put it within the facility. From my experience, they are usually those who knew each other back home though it would not be unexpected for a clique to be formed of those who didn't know each other before coming here. As for control, they don't have much except over other inmates.