Auschwitz concentration camp

Auschwitz I was first suggested as a site for a concentration camp for Polish prisoners by Oberfuhrer Arpad Wigand. The first prisoners arrived in May 1940 consisting of 728 Polish prisoners that included 20 jews.
Next came Auschwitz II-Brikenau which began in October 1941 to create less tension at the main camp. Himmler intended the camp to house 50,000 prisoners of war. Eventually there was as many as 200,000 inmates which led to plans of expansion.
Construction of Auschwitz III began with an initial force of 1,000 workers from Auschitz I assigned to work on the construction. By 1943 this number increased to 7,000 but the year after it had gone to 11,000. About 35,000 inmates worked at this plant but sadly 25,000 died. In January 1943 the labor education camp was moved from the parent camp to Monowitz.
http://en.wikipedia.org/wiki/Auschwitz_concentration_camp#Auschwitz_I