Karate Warriors (1976)
Original title: 子連れ殺人拳Sorry, no trailer
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A karate fighter and a samurai join opposing gangs to take them down from the inside.
Storyline
Chico arrives in a city where there are two waring gangs. Chico gets wind of a large hidden stash of heroin owned by the, now dead, former leader over all of the gangs and sets off to find it and keep the two gangs at war. Meanwhile, he as befriended a small boy whose father is a samurai assassin working for the rival gang.