Depends on what you mean by "did well." The mob was gone from the casinos by the mid-1980's. Some of the families hovered on the fringes of things into the 1990's - loansharking, telemarketing scams, slot cheating, nightclubs, escorts, etc. But by the new millennium there was said to be only about a dozen or so actual made guys still living in Vegas and some of them were in prison. In 2011, it was reported that Asian and Eurasian OC was now a bigger priority for the FBI in Vegas than the LCN. The mob's extensive bookmaking networks still extend out to places in the west like Vegas, Phoenix, LA, and San Diego but there doesn't seem to be any standing, active crews. Just individual mobsters here and there, some not active anymore. There's a reason the last semi-significant news out of Vegas involving the mob was the Crazy Horse case from 2003.