No regular army officer had anything to fear from SS people until 20th July of 1944.
As a reaction to the coup attempt, Hitler pretty much copied stalin's system.
US Nazi films often mix a lot of things. The SS was no KGB.
The Gestapo was, weird as it sounds, Police. It had no jurisdiction over the military.
Back then, the military had its own jurisdiction with its own criminal code.
Gestapo was responsible for prosecuting political dissenters among the civilian population.
Its a safe bet that before 1944, no military officer was ever arrested by Gestapo.
After that, a lot were.
The Police was subordinate to SS, this resulted in a lot of mixing like police officers taking part in attrocities and serving in Waffen-SS field divisions.
An old police officer I know had his police basic training in the 1950s and it was basically an antipartisan course by former Waffen-SS people.
To add to the confusion, the military police was not military, but normal police, but NOT subordinate to the SS.
Unlike today's Feldjäger (which are officially soldiers) Feldgendarmerie officers were seconded to the military, but remained police. The SS couldn't give them any orders.
The Waffen-SS itself was a mixed lot. You basically had three roots.
The pre-war Verfügungstruppe, which was basically a military experiment to raise a model force, done by former military officers scorned for their radical ideas (Hausser and Steiner). They wanted to create a ideal military force by a radical break from traditional prussian military traditions, instead drawing on trench comradeship, revolutionary fervor and freikorps spirit, using small unit infiltration tactics.
A sign of that was that in the Waffen-SS, it was not "Herr Scharführer" (or other rank) but simply "Scharführer" without the Herr. There was to be no class distinction between officers and enlisted.
This does not mean the Verfügungstruppe people were not ardent nazis, they just took the revolutionary side of the nazi party more seriously than the rest.
The second root was Hitler's personal bodyguard.
The third were the "Totenkopf" standards, the base units for the concentration camp guards.
These three existed as seperate entities before the war, but blurred together as the war progressed.
Generally, the SS was relatively unimportant in military matters until about 1942.
Before that, the SS was the police, so it had importance for civilians, and it also ran its parallel empire in Czechoslovakia, but the first place in the state was still occupied by the military.
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