So, who's played the most menacing bad guys over the years? Edward G Robinson as the greasy standover man? Kevin Spacey as the grasshopper in Ants? James Gandolfini as the alpha male in The Sporanos? Danny Trejo in Fuck You I'm Danny Trejo?
Gangster 55 (Paul Bettany and Malcolm MacDowell) in Gangster No.1. Harold Shand (Bob Hoskins), The Long Good Friday. Everyone in Performance who isn't female or Mick Jagger - especially John Bindon, who was an actual villain with connections to various Kray-era London faces.
And I have especial love for Ralph Feinnes as Harry in, er, In Bruges.
Raymond Cruz as meth distributor Tuco in Breaking Bad. He fucking oozed menace in every scene, and he beat an associate to death with his fists over a social slight.
Lawrence Tierney - who by all accounts was just as terrifying off screen as on. Will Wheaton sometimes recounts a fairly traumatizing encounter with him when he guest stared in Star Trek: The Next Generation and he scared the cast and crew of Seinfeld so badly that they never asked him back after one guest appearance.
@NeilFord: Malcolm McDowell descends into self-parody in Gangster #1. Paul Bettany was terrifying but I laughed whenever McDowell was on screening chewing things up.
The most recent great scary gangster performances I've seen were from Jacki Weaver and Ben Mendelsohn in Animal Kingdom.
Sir Ben Kingsley in "Sexy Beast," although Ian Mc Shane wasn't a slouch either.
What? No love for the Mafia men of the first "Godfather" movie? The bed present, the bar murder, and the machine gun hit would be enough to deserve mention.
Paul Young in Gangster No.1, mostly for how well he offset being Paul Young. Also, it appeared his character was a homage to Reggie Kray, and he did it with fairly worrying vigour.