Cannibal Ferox (1981)
They raped and killed his sister while he watched helplessly. Now it's his turn to Make Them Die Slowly
Anthropologists take a trip to the jungles of Colombia to study native cannibals. Instead, they find a band of drug dealers, using the natives to harvest the cocoa leaf. After awhile, the natives are tired of being tortured slaves, and turn on their masters, as well as the anthropologists, thus filling the screen with gruesome splatter!