His efforts gave way to the adoption of the United Nations Genocide Convention in December 1948, which came into effect in January 1951.
Genocide:
Article Two of the convention defines genocide as "any of the following acts committed with the intent to destroy, in whole or in part, a national, ethnic, racial or religious group, as such":
Killing members of the group.
Causing serious bodily or mental harm to members of the group.
Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part.
Imposing measures intended to prevent births within the group.
Forcibly transferring children of the group to another group.