Vito Genovese landed his wife by killing her fiancee. Later she turned out to be bisexual, and her testimony helped send him to jail.
Genovese ingratiated himself with Mussolini by having Carmine Galante murder Carlo Tresca, a noted anti-fascist. After enjoying Mussolini's hospitality to escape a murder rap in the US, Genovese turned up in Sicily to welcome the Allied soldiers fighting Mussolini. He was so valued that they turned their backs on his black marketeering.