I'll probably come up with since I love studying the more quiet mobsters who are successful at not getting caught as opposed to the homocidal maniacs (Demeo, Destefano, Tommy Karate) or flashy figures (Gotti, Costello).

How about "Johnny Dio", aka Giovanni Dioguardi, ran the Lucchese rackets in the garment center and was a master at union and white-collar extortion. If it wasn't for the Victor Riesel attack and if he had not been under indictment for bankruptcy fraud at the time, I wonder if he would have been made boss after Tommy Lucchese died. The character of "Johnny Friendly" in On the Waterfront was based off of Dio.