Calogero Vizzini, Italian mob boss (died 1954)

Calogero Vizzini, also commonly known as "Don Calò", was a Sicilian Mafia boss of Villalba in the province of Caltanissetta, Sicily. He was considered to be one of the most influential and legendary Mafia bosses of Sicily after World War II until his death in 1954. In the media, Don Calò was often depicted as the "boss of bosses" – although such a position does not exist in the loose structure of Cosa Nostra.