At present, there are hundreds of thousands of prisoners in Germany of all nationalities and degrees, partly in camps, but for the most part, however, as workers... The dangers of inter-mixing and bastardizing of our people are extraordinarily grave. They lie to a great extent in the almost unlimited lack of knowledge throughout our nation of the problems of blood.

(3 July 1940). Quoted in "Trials of War Criminals Before the Nuernberg Military Tribunals" - Page 117