Gestapo

Gestapo ex Wiki
QUOTE
The Gestapo (abbreviation of Geheime Staatspolizei, "Secret State Police") was the official secret police of Nazi Germany and German-occupied Europe. Beginning on 20 April 1934, it was under the administration of SS national leader, Heinrich Himmler who in 1936 was appointed Chief of German Police (Chef der Deutschen Polizei) by Hitler.^[2] In 1936, Himmler made it a suboffice of the Sicherheitspolizei (SiPo) ("Security Police"). Then from 27 September 1939 forward, it was administered by the Reichssicherheitshauptamt (RSHA) ("Reich Main Security Office") and was considered a sister organization of the Sicherheitsdienst (SD) ("Security Service").
UNQUOTE
The Gestapo was at the heart of the Nazi regime. They did what secret police do the world over but it turns out that they were much nicer people than the Cheka, the Soviet version. If you doubt it go to the article published by Ron Unz; it is called #Leather-Jacketed Coke-Snorting Jews in the Soviet Secret Police Torturing, Raping and Killing Gentiles - The Evidence. The Cheka was worse because it was run by Jews having fun.

 

Leather-Jacketed Coke-Snorting Jews in the Soviet Secret Police Torturing, Raping and Killing Gentiles - The Evidence, by Karl Nemmersdorf - The Unz Review 
Is the rather picturesque title an exaggeration? I believe not. Mr Nemmersdorf makes the case for an insane level of hatred and total lack of restraint by Jews. Was their hatred justified? Possibly to some slight extent but they went far beyond that. They were Psychopaths doing what psychopaths like; having fun. He tells that the Weather Underground, a bunch of terrorist Jews was just as a vicious & hate filled as Felix Dzerzhinsky's  chosen thugs.  

Karl may well be using a pseudonym based on the Nemmersdorf Massacre carried out by the advancing Soviets.