The treatment of intellectuals under the rule of the khmer rouge, of the jews in europe during world war ii, and of the armenians in the ottoman empire are examples of

genocide

Explanation:

Genocide may be defined as the mass murder or the cleansing of a group of people in parts or in whole. It is the killing of a large number of people especially of a definite category such as definite religion, race, ethnic group, or of a particular nation.

The Armenian genocide was the murder of around 1 million ethnic Armenians of Anatolia and the nearby regions. This killing was done by the government of Ottoman during world war II.