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Bruce's research as you get to know it from the interview, although it does reveal the pumped up paranoia of the soviet system, does teach rather something else. It shows how the Stasi was organized. Where did the agents come from, how were they trained and employed. And once there were agents, there was the recruiting and management of informants. Bruce's story about his research also reveals what happened to the Stasi and its files once the DDR fell apart and with it its secret police. This all went so swift, the Stasi disintegrated before it could destroy its archives. And this allows many historians such as Bruce to study the Stasi and by extension the reality of a surveillance state.
More NBIH:
War in Human Civilization,
Always recommended: New Books in History,
The best varied history podcast,
The Caucasus,
The genocide and the trial.