As a teenager, Siegel met and formed an alliance with future Syndicate leader Meyer Lansky. Known as the Bugs and Meyer Mob, the gang operated out of Manhattan's Lower East Side. Working mainly in bootlegging, Siegel and Lansky's gang eventually folded into the Syndicate, a loosely bound organization that unified mobsters from various national gangs. A separate "enforcement" branch of the Syndicate was created simply for carrying out murders. Siegel was one of the founding members
Frank "The German" Schweihs. The most feared hitman in Chicago or anywhere. Most people don't know this, but Frank was an assassin for ALL kinds of "groups" and people. He did hits for people in high places and NOT JUST mobsters!
Carlo Gambino was a quiet, but very dangerous man. Allegedly he killed his way to the top of the Gambino family, heading the crime family for 20 years, and The Commission for more than 15 years. Remarkably Gambino spent a total of 22 months in prison for his life of crime.