"The Big Boss" (1971):
Cheng Chao-an, a young Chinese man who has sworn off fighting, moves to Thailand to work in an ice factory with his cousins.
He soon discovers the factory is a front for a drug smuggling operation. When his cousins disappear after refusing to join the operation, Cheng is forced to break his vow of non-violence and take a stand against the corrupt forces.
The film culminates in a final showdown between Cheng and the boss of the criminal enterprise.