Structure of Berlin Police force in Weimar Germany and cooperation between these forces

Jun 2019
Jerez de la Fra.
Good morning,

I'm currently searching for the ranks and structure of the Berlin Police force in Weimar Germany (1919-1933). What was the structure inside the Kriminalpolizei, the Schutzpolizei and other forces? How did they interact and cooperate with each other in cases? Do these ranks differ from those which are used nowadays in Germany? I would be grateful if you could give information about this subject, due to the lack of documents in this area.