Atrocities in the Congo Free State
From 1885 to 1908, many atrocities were committed in the Congo Free State (today the Democratic Republic of the Congo) under the absolute rule of King Leopold II of Belgium. These atrocities were particularly associated with the labour policies, enforced by colonial administrators, used to collect natural rubber for export.
Source: Wikipedia — Atrocities in the Congo Free State (CC BY-SA 4.0)