Vito 'Don Vito' Cascioferro, former Sicilian Boss of Bosses. Speculation is he sent Salvatore Maranzano to America in order to setup the mafia there. He was responsible for establishing the strong connection that still exists between the Sicilian and American Mafias. He died in Sicilian prison.
Giuseppe "Joe" Profaci: (Sicily, October 2 1897– Queens, June 7 1962) was a New York La Cosa Nostra boss who was the founder of what is today known as the Colombo crime family. Established in 1928, this was the last of the Five Families to be organized. He was the family's boss for over three decades.
Lucky Luciano: Mysterious Tales of a Gangland Legend
Charles “Lucky” Luciano is one of the most researched, discussed and dissected American mobsters of all time. His name has become synonymous with New York City’s high drama gangland days of prohibition bootlegging, the formation of the infamous five families, and controversy over his alleged ‘Last T
Vincenzo 'Vincent' Mangano founding Boss of Mangano Family which would later become the Genovese Family when Albert 'Mad Hatter' Anastasia makes him disappear never to be found
Mobsters, Gangs, Crooks and Other Creeps-Volume 2 - New York City
Murder Inc. Killer Allie Tannenbaum became an informant against his former boss Louie "Lepke" Buchalter. As a result Lepke was executed in Sing Sing Prison, and remains the only mob boss ever executed by the US government.
Frank Nitti was the one of Al Capone’s top henchmen, known as The Enforcer who was in charge of all strong-arm and muscle operations for the Chicago Outfit, and later the front-man following Al Capone’s prison sentence.