An Eye for an Eye (1981) on Netflix

Plot summary

Sean Kane and his partner Dave Pierce work undercover for the San Francisco police narcotics unit. They meet an informant, Tony Montoya, who says he can name the head of a drug ring, and Pierce is killed. Kane's superior, Captain Stevens, wants him punished for throwing one of the killers from a third-story window in front of witnesses, so Kane resigns and sets out after the men responsible. Dave's girlfriend, the reporter Linda Chan, intends to expose the gang through her reporting. Kane asks his friend the detective Tom McCoy to keep him informed, but Stevens takes charge of the inquiry. The editor Morgan Canfield offers Kane his help.