The SS : Hitler's Instrument Of Terror / G. Williamson. - London, 1994. - p. 94
The Geheime Staatspolizei, the Gestapo, was one of the most unfamous police organisations in the 1930s and 1940s. The Gestapo was widely represented in the occupied zones but also in Germany, for example with an office in Düsseldorf.
Geheime Staatspolizeistelle Düsseldorf