James Colosimo, Italian-American mob boss (b. 1878)
Vincenzo Colosimo (Italian: [vinˈtʃɛntso koˈlɔːzimo]; February 16, 1878 – May 11, 1920), known as James "Big Jim" Colosimo or as "Diamond Jim", was an Italian-American Mafia crime boss who emigrated from Calabria, Italy, in 1895 and built a criminal empire in Chicago based on prostitution, gambling and racketeering. He gained power through petty crime and by heading a chain of brothels. From about 1902 until his death in 1920, he led a gang that became known after his death as the Chicago Outfit. Johnny Torrio was an enforcer who Colosimo imported in 1909 from New York and who seized control after his death. Al Capone, a Torrio henchman, allegedly was directly involved in the murder.