The Belgian rule of the Congo was very, very brutal, perhaps one of the most brutal in the history. The indigenous population was required to provide rubber to the colonizers, but the amount of rubber was unrealistic, and the punishment for this was death. Because of this, great amount of people died or were mutilated (cut off right hand was a "proof" of killing someone, so sometimes people just cut off hands to prove they killed an indigenous person and claim the reward..).