When Nazi Germany attacked Poland on September 1 , 1939 , German Nazis began rounding up and killing the local intelligentsia ( see : Operation Tannenberg ) and forbade all higher education except for vocational ( " useful " ) training . Abraszewski survived five different Nazi concentration camps , including the Wildflecken Labor Camp and Mauthausen , where he made minute sketches for the administration
Operation Tannenberg
Operation Tannenberg
Piotr Abraszewski