Christian Bale, who made headlines recently thanks to his tirade on the Terminator: Salvation set, worked with Johnny Depp in the gangster flick Public Enemies. Directed by Miami Vice and Collateral filmmaker Michael Mann, the picture centers on agent Melvin Purvis’ (Bale) attempts to bring down gangster John Dillinger (Depp). Bale talked about the research he did for the role.