Sonny Corleone, for one, was a CAPO in the Corleone crime family in the novel and film The Godfather. A CAPO is an Italian word meaning 'HEAD' or 'CHIEF' and is used to describe a high-ranking member of a Mafia family. In the novel and film, Sonny was the eldest son of Vito Corleone and the brother of Michael Corleone. He was known for his hot temper and violent outbursts, which often led to trouble for the Corleone family.