Underground movements World War, 1939-1945 83 History 75 Guerrillas 20 Secret service 10 Holocaust, Jewish (1939-1945) 8 Guerrilla warfare 7 Jews 7 Anti-Nazi movement 5 Campaigns 5 Politics and government 5 Women 5 Aerial operations, British 4 Collaborationists 4 Government, Resistance to 4 Influence 4 Soldiers 4 Aerial operations, American 3 Counterinsurgency 3 Courage 3 Escapes 3 Espionage, British 3 Foreign relations 3 Jewish resistance 3 Participation, Female 3 Rescue 3 Secret societies 3 Social conditions 3 Societies, etc 3 Spies 3