Umberto Lenzi	...	(Director)
Umberto Lenzi, Umberto Lenzi	...	(Writer)
Giovanni Lombardo Radice	...	Mike Logan (as John Morghen)
Lorraine De Selle	...	Gloria Davis
Danilo Mattei	...	Rudy Davis (as Bryan Redford)
Zora Kerova	...	Pat Johnson (as Zora Kerowa)
Walter Lucchini	...	Joe Costolani (as Walter Lloyd)
Fiamma Maglione	...	Myrna Stenn (as Meg Fleming)
Robert Kerman	...	Lt. Rizzo
John Bartha	...	Brooklyn Mobster
Venantino Venantini	...	Sgt. Ross
'El Indio' Rincon	...	Native who helps Gloria

Comments: They raped and killed his sister while he watched helplessly. Now it's his turn to Make Them Die Slowly

Summary: 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!