There is a TV series based on Ian Kershaw's work on Nazi Germany [1]. One Gestapo office had not been able to destroy their records and it was found that most arrests of people were done as a result of them being denounced by their neighbours not by any actions of Gestapo personnel.
I’m not surprised. Many totalitarian regimes set up systems where neighbors can report on “counterrevolutionary” activities in which an abusive system “gets abused” and people use it for personal revenge among other things.
