Genocide is understood to be the gravest crime against humanity, defined as the mass killing of a whole group of people in an attempt to wipe them out of existence. The term was coined in 1943 and the UN formally defined genocide in 1948 as killing, harming, or forcibly transferring members of a national, ethnic, racial or religious group with the intent to destroy that group. While some say only the Holocaust was a genocide of the 20th century, others point to the killing of Armenians, Rwanda, Srebrenica, and Soviet and Cambodian mass killings as well. Recent genocides include charges against Sudan's president for Darfur and the US labeling ISIS actions as genocide.