Lucky Luciano
Lucky Luciano is one of the bosses of the Mafia. He orders the slaughter of 40 other responsibles, therefore becoming the only boss. But a few years later he is put into jail. In 1946, he got a pardon and is sent back to Sicilia. There, he begins becoming one of the chief of the Mafia. The US Army seems to refrain from interfering.
Starring Gian Maria Volonté, Edmond O'Brien, Rod Steiger, Vincent Gardenia, Silverio Blasi, Charles Cioffi, Larry Gates, Magda Konopka, Jacques Monod, Dino Curcio
Watch "Lucky Luciano" from streaming services Mubi, Kanopy released in 1973. It's a crime and drama movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie.