1940 January 20 Dr. Ritter writes in a progress report to the DFG: "Through our work we have been able to establish that more than ninety per cent of so-called native Gypsies are of mixed blood... The Gypsy question can only be considered solved when the main body of asocial and good-for-nothing Gypsy individuals of mixed blood is collected together in large labour camps and kept working there, and when the further breeding of this population of mixed blood is stopped once and for all." (Science)