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Ruby was a smalltime hoodlum and owner of a strip club frequented by certain members of the Dallas police. Ruby, a wannabe, liked being 'on the in' with the cops and served up freebees to them off hours. This explains why Ruby had access to the area where he shot Oswald.
If Ruby was hired to 'shut Oswald up', whoever his employer was must have been someone outside the government. If the CIA or the FBI were involved, it would have been so much easier, and less suspicious, to kill Oswald in prison, or during interrogation. I'll admit, though, that Oswald's history: moving to the USSR during the Cold War, for example, is awfully odd.