Maybe not initiated into Cosa Nosta, but I have to mention Sindona.

Michele Sindona (May 8, 1920 – March 22, 1986) was an Italian banker and convicted felon. Known in banking circles as "The Shark", Sindona was a member of Propaganda Due (#0501),[1] a secret lodge of Italian Freemasonry, and had clear connections to the Sicilian Mafia. He was fatally poisoned in prison while serving a life sentence for the murder of lawyer Giorgio Ambrosoli.