Following the First World War it was erected concentration camps for German civilian population in the areas that became part of Poland, including camps Szczypiorno and Stralkowo. In the camps the inmates were abused and tortured.
After 1926 several other concentration camps were erected, not only for Germans, but also for Ukrainians and other minorities in Poland. It included camps Bereza-Kartuska and Brest-Litowsk. Official casualities for the camps are not known, however it has been estimated that many Ukrainians died.
From the start of 1939 until the German invasion in september a number of more concentration camps for Germans, including Chodzen, were erected. Also German population were subject to mass arrest and violent pogroms, which led to thousands of Germans fleeing. In 1,131 places in Poznan/Posen and Pomerania German civilians were sent into marchs to concentration camps. Infamous is the pogrom against Germans in Bydgoszcz/Bromberg, known to many Germans as Bromberger Blutsonntag.
Following the Second World War the Soviet-installed Stalinist regime in Poland erected 1,255 concentrations camps for German civilians in the eastern parts of Germany that were occupied and annexed by Communist Poland. The inmates were mostly civilians that had not been able to flee the advancing Red Army or had not wanted to leave their homes. Often were entire villages including babies and small children sent to the concentrations camps, the only reason being they spoke German. Some of them were also Polish citizens. Many anticommunists were also sent to concentration camps. The death rate in the camps were between 20 and 50 %. Some of the most infamous concentration camps were Toszek/Tost, Lamsdorf, Potulice, Świętochłowice/Schwientochlowitz. Inmates in the camps were abused, tortured, maltreated, exterminated and deliberately given low food rations and epidemies were created. Some of the best known concentration camp commanders were Lola Potok, Czeslaw Geborski and Salomon Morel. Several of them, including Morel, were Jewish Communists. Morel is currently hiding in Israel, and has been charged for war crimes and crimes against humanity by Poland.
The American Red Cross, the US Senator Langer of North-Dacota, the British embassador Bentinck and the British prime minister Winston Churchill protested against the Polish concentration camps, and demanded that the Communist authorities in Soviet-occupied Poland respected the Geneva Conventions and international law, however internationals protests were ignored by the Communists.
At least between 60,000 and 80,000 German civilians were murdered in the Communist Polish concentration camps.