A network of slave-labour camps &ndash; 457 complexes with dozens of subsidiary camps , scattered over a broad area of German-occupied Poland &ndash; exploited to the fullest the labor of their prisoners , in many cases working inmates to their death . At the Gross-Rosen concentration camp ( to which Polish nationals were brought in from the annexed part of Poland ) the number of subcamps was ninety seven ( 97 ) . Under Auschwitz , Birkenau , and Auschwitz III ( Monowitz ) with thousands of prisoners each , the number of satellite camps was forty-eight ( 48 ) . Stutthof concentration camp had forty ( 40 ) subcamps officially and as many as 105 subcamps in operation , some as far as Elbląg , Bydgoszcz and Toruń , from the main camp . The '' Deutsche Reichsbahn '' acquired new infrastructure in Poland worth in excess of 8,278,600,000 złoty , including some of the largest locomotive factories in Europe , the H. Cegielski – Poznań renamed DWM , and Fablok in Chrzanów renamed '' Oberschlesische Lokomotivwerke Krenau '' as well as the locomotive parts factory Babcock-Zieleniewski in Sosnowiec renamed Ferrum AG later tasked with making parts to V-1 i V-2 rockets also . Under the new management , formerly Polish companies began producing German engines BR44 , BR50 and BR86 as early as 1940 with the use of slave labor
annexed part of Poland
Expulsion of Poles by Nazi Germany
Economy of Nazi Germany