Guerilla and Underground Resistance in World War II

Resistance to German occupation was widespread throughout Europe. In Western Europe the resistance movement centered around underground (secret) organizations that committed sabotage, aided downed Allied fliers, and worked with Allied intelligence agents.

Nazi Concentration Camps

Shortly after they came to power in 1933, the Nazis established a system of concentration camps where their political opponents and others the Nazis considered "undesirable" were imprisoned.