In your opinion, what are the best gangster films or television series ever? And why do you think so?

Here's some standard operating procedure. Stay the fuck away from Tony Soprano, shut the fuck up and listen. It's over. Capisce? Over and done. You call, or go anywhere near him or his family and they'll be scraping your nipples off these fine leather seats. And here's the point to remember: my face is the last one you'll see, not Tony's, we understand each other? It won't be cinematic.