There were two groups of the Partisans, the Soviet Partisans and the Jewish Partisans. The Soviets started attacking camps in 1941 to 1946, but in 1944 they had lost a huge amount of their forces due to them being caught and tracked down. Even though the war only lasted until 1945, there were camps with people still in them until 1952.
The soldiers were to far into Nazi lines to try to return home, so they used guerrilla warfare and stayed in Germany and formed a resistance to free the other soldiers and the other prisoners. Even though they freed the other people, they used them a workers and slaves, just treated slightly better. Even though there wasn't a single person that started it, the details about the people and some other info are still covered up.