I'm with Tony Montana on Scarface ('32) and Mean Streets (stupendous performances by DeNiro and Keitel). For older gangster films, try the two Edward G. Robinson classics: Little Caeser and Key Largo. And don't miss the great Cagney in White Heat.

Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.