 Complete the following phrase:  The Nazis considered most Slavs to be non-Aryan Untermenschen. The Nazi Partys chief racial theorist, Alfred Rosenberg, adopted the term from Klansman Lothrop Stoddards 1922 book The Revolt Against Civilization: The Menace of the Under-man. In the secret plan Generalplan Ost Master Plan East the Nazis resolved to expel, enslave, or exterminate most Slavic people to provide living space for Germans, but Nazi policy towards Slavs changed during World War II due to manpower shortages which necessitated limited Slavic participation in the Waffen-SS. Significant war crimes were committed against Slavs, particularly 