Yakuza Graveyard (1976)

When a cop is transferred to a new precinct it is obvious that the area's yakuza mob are not dealing with just another policeman. The cop is bent on results and is not immune to becoming rough in order to get results. Matters take a different turn, however, as the policeman juxtaposes the nature of his targets with his own colleagues, examines their actions more closely and becomes acquainted with a woman on the fringe of the criminal underworld.