Julius Ludolf worked at concentration camps from January 1940 to May 1945. At first he was commander of concentration camp Loibl, a satellite camp of the Mauthusen Gusen concentration camp system in the Karavanke mountains. In August 1943 he took over for Karl Schöpperle in the subcamp of Großraming and starting from May 1944 the final commander of satellite camp Melk affiliated with the Steyr-Daimler-Puch company.