'In Bruges' is a recent good movie also...

"Pritzi's Honor"

Here are some good ones that are older and lesser known

Mean Streets - (1973) Martin Scorsese film starring Harvey Keitel and Robert De Niro

American Me - (1992) Mexican-American Mafia kingpin played by Edward James Olmos is released from prison

A Bronx Tale - (1993) Robert De Niro and Joe Pesci

Gotti - (1996)HBO Movie that led to the development of the Sopranos

Rounders - (1998) Matt Damon and Ed Norton take on the Russian mafia in poker

Lock Stock and Two Smoking Barrels - (1998) Guy Ritchey directed film based in London.

"Pritzis Honor" as usual Johann comes through with a truly great one that I forgot about...my bad.

Charlie

Big Lebowski.

Has two mobs: The Malibu porno mob of Jackie Trehorn and the German nihilist mob.

It's got marmots, fascist police chiefs, carpet-pissers, urban achievers. It's got everything.