Spie = Marlon Brando as The Godfather in the eponymous film
Commissarios = John Gotti as in the late mafia boss
Dons = Al Pacino as Tony Montana in Scarface
Underboss = Robert De Niro as Neil McCauley in Heat
Men of Honour = Andy Garcia as Vincent Corleone in The Godfather
Caporegime = Robert De Niro as Vito Corleone in The Godfather (I think)
Capodecima = Christopher Walken as Vincenzo Coccotti in True Romance
Wise Guys = James Gandolfini as Tony Soprano in the Sopranos
I can't remember who for hitman and gangster though I'm afraid.
//edit, damn that took about 10 minutes worth of remembering, there were no posts when I started.

This info should probably be included in the user maintenance rules though so people can just post "Read the FAQ nooob!!!!!".
