House of Bamboo (1955)

This well-photographed crime drama was filmed in post-WW II Japan and tells the tale of an American military agent who attempts to bust up a corrupt group of Yankee soldiers who have formed a mini-syndicate to operate a string of crooked pachinko palaces. He gets involved following the murder of another soldier. To succeed, the hero must somehow infiltrate the mob and he does this by cozying up to a Japanese widow of a deceased gang member. The ploy works and the agent becomes a gangster. Trouble brews when a robbery goes awry and the ruthless gang leader realizes he has a traitor in his midst...