In Casino the story revolves around the mob stealing from the Tangiers casino by skimming off the top of all money earned. In order to get away with this, they seem to have their people in place - they get their man, Sam "Ace" Rothstein to run it, they arrange the loan which allows the casino to be built in the first place, etc.
The fact that they have the authority to do all this implies to me that they own the casino, but that flatly contradicts the fact that they are stealing from it! So the question is, who actually owns it? Who are they stealing from? And if they don't own it, how are they able to impose their will on it? The real owner(s) never seems to be mentioned in the film, e.g. being intimidated or conned into hiring Rothstein, etc.