World War, 1939-1945 History 22 Holocaust, Jewish (1939-1945) 7 Campaigns 6 Jews 6 Atrocities 4 Politics and government 4 more ... Ethnic relations 3 Prisoners of war 3 Underground movements 3 Armed Forces 2 Causes 2 Foreign relations 2 Germans 2 History - 20th century 2 History of Russia. Soviet Union. Former Soviet Republics 2 History-Military 2 International relations 2 Jewish refugees 2 Military campaigns 2 Persecutions 2 Prisoners and prisons 2 Public opinion 2 Rescue 2 Secret service 2 War 2 Aerial operations, American 1 Aerial operations, British 1 Aircraft carriers 1 American 1 less ...