An Eye for an Eye (1981) on Netflix

Sean Kane is an undercover police officer assigned to the Narcotics division of the San Francisco Police Department. In the beginning of the film, there is an undercover operation, involving an informant, and things go sour when Norris' partner is killed. He resigns from the SFPD, and his partner's girlfriend, a TV news reporter, is murdered. Unknowingly to Norris is that the assignment that he was working undercover on was connected to a smuggling operation involving the Chinese Tong, and the deaths of his partner and his girlfriend are connected to an investigative report that involved the smuggling operation. In this Dirty Harry-like film, Norris goes beyond the law and goes after those responsible for the deaths of his partner and girlfriend.