Everybody has heard of the Kray twins, and if you haven't, they ran organised crime in London for most of the 60's. One of the best things about this movie is that both twins are played by Tom Hardy. I don't know how they did it but it's filmed really well (especially when they're fighting each other in one scene) and two cracking performances from Tom Hardy wrapped up in one film.
Legend is a great gangster movie and follows the twins as they take over London. The twins are very different, Ronnie being completely crazy and wreckless while Reggie is calmer and more calculated, having to reign in his brother. Ronnie is eventually the cause of their fall from organised crime kingpins, shooting a high ranking member of an apposition crime syndicate.
There's a great supporting cast including Taron Egerton, Christopher Eccleston, David Thewlis, Paul Bettany, Emily Browning, Tara Fitzgerald and there's even a few appearances from Duffy who did a lot of the singing in the Krays' club.
Defenately put it on your watch list!