Articles relating to Collaboration with the Axis Powers. The Axis powers (1940-1945) were the nations that fought in World War II against the Allies. The Axis powers agreed on their opposition to the Allies, but did not completely coordinate their activity. Within nations occupied by the Axis powers in World War II, some citizens and organizations, prompted by nationalism, ethnic hatred, anti-communism, antisemitism, opportunism, self-defense, or often a combination, knowingly collaborated with the Axis Powers. Some of these collaborators committed war crimes, crimes against humanity, or atrocities of the Holocaust. In some cases, collaborators joined the armies of Axis Powers, despite not being citizens of the state whose military they joined.