Overkill (1987)

Violence, murder and terror become everyday occurrences in Little Tokyo. The tiny Japanese American community is taken over in an iron-fisted reign of terror by the infamous Yakuza organization. Yakuza mobsters extort money from the residents for the privilege of staying alive. One maverick detective and the brother of a dead Yakuza victim form their own counter death squad to fight the Yakuza. The detective and the surviving brother resort to every from of counter-terrorism, every weapon available, to stop the sinister Yakuza.