There are probably people on here who know more than me but from what I've read Casino was a fairly accurate portrayal of the Outfit's involvement in Vegas. Maybe other mobs still had involvement but I think that was the end for Chicago.

Not sure what you mean with the 'no violence' rule as Tony Spilotro (Pesci in the movie) was one of the most violent gangsters in the history of the mob. If I remember correctly the rumor was that he single handedly more than doubled the murder rate in Vegas.