Like all totalitarian societies, the "Third Reich" had an expansive and efficient police capability. There were no "rights" in the sense of the Bill of Rights like the United States has. Individual police captains and magistrates had wide ranging powers to decide on criminal matters. Police could lock up private citizens for any reason for any length of time. It was mostly a system based on delegated power, not on procedures of justice. This system relied completely on the honesty and fairness of individual bureaucrats rather than on process.
For example, let's say your friend got arrested for theft, just on suspicion, no proof. A magistrate still might send him to jail, just because the police said they suspected he was a thief. But now, let's say you think the policeman involved had a personal reason for arresting your friend and trumped up the charges. In that case you could complain to some higher official who would investigate. If your complaint turned out to be true, the policeman would get in SERIOUS trouble (like get-sent-to-a-camp trouble). That's the way the system worked. The officials had total power, but if they were caught abusing the power, the system would turn against them hard, very hard.
This system resulted in a very safe, crime-free but fearful environment. Everyone was always very fearful, because you needed to avoid even the suspicion arising that you might have done something wrong. Even the officials were afraid all of the time, because a higher official had the same power over them, that they had over citizens.
As the economy collapsed, the system became very vicious because "economic crimes" like black market trading were necessary to feed yourself or get other necessities. This turned everyone into "criminals", so life became one of everyone living in total fear all the time of being punished.