atrocity
any of the three legally defined international crimes of genocide, war crimes, and crimes against humanity, and also ethnic cleansing
ethnic cleansing
various ways of displacing or exterminating human beings from another ethnic group from a territory
massacre
incident where some group is killed by another
Atrocities in the Congo Free State
atrocities perpetrated in the Congo Free State (today the Democratic Republic of the Congo) which, at the time, was a colony under the personal rule of King Leopold II of Belgium
war crime
individual act constituting a serious violation of the laws of war
genocide
crime against humanity consisting of the planned and deliberate extermination of a people
crime against humanity
grave wrongful act as part of a widespread or systematic attack directed against any civilian population