Poachers mindlessly killing game for fun and profit. Hands being chopped off a la Colonial Congo. Arabs being massacred on mass during the Zanzibar revolution. Simba rebels killing and being executed in return. White mercenaries fighting in the Congo.
All of these things, and many more, are followed by this classic Mondo film. It's flawed (its narrative is shamelessly colonialist, avoiding all the atrocities that the colonizers committed and the actual causes for nationalism that led to these tragedies), but this is Heart of Darkness for the film generation: It is a glimpse into the worst that Africa has to offer, and nobody comes out looking good.
Highly recommended, if you got the stomach to watch some of the most senseless butchery ever recorded on film. If only these guys had done Vietnam.