Originally posted by The Italian Stallionette:
If by greatest you mean the most successful and smartest, or the one that managed not to get caught
In this regard it would probably be Luciano, Gambino, Lanskey, Costello, Profaci, Marcello, Traficante.
However, if you want to define it as the gangster who most typified the gangster persona, smarts, violence, power, guns a blazing type, I'd put Capone, Genovese, Anastasia, Giancana, Buchalter, Gallo....
