Giancana, were involved in some way with the John F. Kennedy assassination have been alleged repeatedly but have not been proven. Documents never seen by the Warren Commission have revealed that some Mafiosi worked with the CIA on assassination attempts against Cuban leader Fidel Castro. CIA documents released in 2007 confirmed that in the summer of 1960, the CIA recruited ex-FBI agent Robert Maheu to approach the West Coast representative of the Chicago mob, Johnny Roselli. When Maheu contacted Roselli, Maheu hid the fact that he was sent by the CIA, instead portraying himself an advocate for international orporations.
He offered to pay $1 50,000 to have Castro killed, but Roselli declined any pay. Roselli introduced Maheu to two men he referred to as “Sam Gold” and “Joe. ” “Sam Gold” was Sam Giancana; “Joe” was Santo Trafficante, Jr. , the Tampa, Florida boss and one of the most powerful mobsters in pre-revolution Cuba. Glenn Kessler of The Washington Post explained: “After Fidel Castro led a revolution that toppled a friendly government in 1959, the CIA was desperate to eliminate him. So the agency sought out a partner equally worried about Castro”the Mafia, which had lucrative investments in Cuban casinos. “