Dominic 'Donny Shacks' Montemarano - Current or former acting underboss of the Colombo family despite being based in Los Angeles since the 1990's. He was involved in college football match fixing, sports betting and also invested heavily in the movie industry. He has been seen in the company of Elizabeth Hurley and was a pallbearer at Sonny Bono's funeral.

I think he was running high-end card games at one point and doing shy off of that, apparently he was renting mansions where he organized card games and had expensive prostitutes to entertain the players, or am I thinking of another New York mobster that based himself in Los Angeles?

I find him fascinating because of his high status in the Colombo family despite being based in Los Angeles for many years and also the fact that he moved to Beverly Hills and got involved in the Hollywood movie industry which is unusual for an active mobster.