James Colosimo, Italian-American mob boss (died 1920)

Big Jim Colosimo

American mobster (1878–1920)

Vincenzo Colosimo, 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…