Labor grew increasingly scarce in the German economy during the war. For this reason, a growing number of concentration camp prisoners were forced to work in businesses and the armaments industry. It was therefore important to know whether some of the prisoners were skilled laborers, which is why they were asked about their training and occupation. Occasionally prisoners were trained as skilled laborers in the concentration camp itself; for example, young Soviet men were trained as stonemasons in the Gusen concentration camp. This was unusual, however.