History of the resistance in WW2

During the Second World War, resistance occurred in all occupied countries. This varied from reading resistance newspapers to hiding pilots who had crashed, or to revolting against the occupiers themselves armed. The resistance is also referred to as 'the underground'. Among the best known resistance groups were the Polish Interior Army, the French Maquis, the Italian Comitato di Liberazione Nazionale, and the Greek and Yugoslav Partisans. The Communist Resistance was among the most fierce groups because the communist ideology was in many ways the exact opposite of that of the Nazis. In addition, communists were often militant and organized before the war. The resistance fighters are also considered heroes in Germany

Many countries had groups dedicated to opposing the Nazis. Germany itself also had various resistance groups. While Britain itself did not face an invasion, preparations were made for a resistance group called Auxiliary Units in the event of a German invasion. Various organizations were formed to form or support foreign resistance groups. Examples of this are the British SOE and the American OSS, predecessor of the CIA.