In February 1946 Anker was arrested together with the office manager in P. Schreiner sen. &amp; Co, on suspicion of "economic treason", as a part of the legal purge in Norway after World War II. Specific accounts were his involvement in the collection of 8000 tons of tin for Wehrmacht, stockpiling of 12,100 tons of iron for the Kriegsmarinewerft in Horten, stockpiling of iron at the grounds of his companies in Florø, Harstad and Trondheim, as well as utilization of forced labour in doing so, delivery of spikes to a "Luftgau-Kommando", building of armed whaling vessels for the "Kriegsmarine", "statements during the war" and collection of business orders issued by Germany while the Second World War was still ongoing in Norway.