"Going Clear", both the book and the Documentary, will tell you everything you need to know about the COS.
And the book offers solid proof that Cruise is not just the face of the COS, but aside from Misciviage, the president of the church, Cruise is probably the most powerful individual in the Chruch. He is not being exploited by the leadership, he is part of the Leadershiip.
But don't try telling the Cruise fanboys that. They reject not only any criticism of Cruise, but any criticism of the COS as well. One guy here said the more bad things he hears about the COS, the more he will support Cruise....