I agree with DonAlx, Donnie Brasco was fantastic. I suggest Serpico, Pulp Fiction, Goodfellas and Reservoir Dogs as well. For non mob related movies try viewing Blow, The Matrix, Fight Club and Forrest Gump.
"Life is so beatiful" - Don Vito in The Godfather novel "My name is Michael Corleone...There are people who'd pay a lot of money for that information" - The Godfather
