My review was written in September 1981 after a Times Square screening:
Filmed in 1973 but just released domestically to cash in on the presence of currently hot chop-socky star Chuck Norris in the cast, "Slaughter in San Francisco" is a curiosity item representing an early by Raymond Chow's Golden Harvest ("Cannonball Run", "The Big Brawl") to shoot a film in the U. S. Entirely lensed on the West Coast", "Slaughter" nevertheless retains all the defects of a Hong Kong entry (atrocious dubbing and sound effects, tinny score, zoom-crazed camera and wooden acting). Martial arts fans may feel ripped off by the presence of supposedly "starring" Norris in a supporting role.
Clearly designed for the Far East audience, pic is set in a mythical "Daly CIty" (supposedly near S. F.) where the police are so ruthless they will kill suspects who refuse to confess. This exaggerated parallel world has all the Caucasian cast members portrayed as evil, including Norris, who looks and dresses much the same as in his familiar heroic roles, but is cast here as a mean gang leader so nasty that he tries to rape his brother's fiancee.
Don Wong is the nominal Chinese hero, an ex-cop out to avenge the murder of his Black partner. Norris' gang is responsible and after numerous 20 against one kung fu battles for Wong, the agile thesp finally goes up against Norris in a well-shot finale. If his fans can last out the tedium until this point, they may get a kick out of seeing invincible Chuck get soundly thrashed.