Sacred Knives of Vengeance (1972)

Hsieh Choun, the Black Dragon, is in trouble with the police since Wang Sien Tien's gang is helping them; he is no longer free to conduct his drugs shipments out of the port freely as he used to. He buys more thugs and killers to dispose of the young upstart, and soon Wang is in dire straits, in the port of Hong Kong.