ANSWER: GENOCIDE
EXPLANATION: GENOCIDE refers to the physical destruction of a group of people (either accidentally or deliberately), due to their ethnic group, race, nationality, or religious beliefs.
However, Genocide had been since addressed in the United Nations Article 2 of the Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG) held in 1948.
Example of Genocide widely known is "the Holocaust", which is used to describe the killing of about six (6) million European Jews by National Socialist German Workers Party in Germany (led by Adolf Hitler).