Schmelt built a highly lucrative slave trade. Over 50,000 Jews from western Poland were forced to work for German businesses, primarily in construction, munitions, and textile manufacturing. The businesses paid Schmelt, who shared a fraction of the money with Moses Merin, the Jewish governor of the region. Almost none of it went to the Jewish laborers. Conditions varied, but were much better than in the large concentration camps: for example, mail and packages could be received in some of the Schmelt camps until 1943, when the Schmelt labor camps became part of Auschwitz and Gross-Rosen. (Oskar Schindler's camp was originally under Organization Schmelt.)