The far left Jacinda government of NZ is clearly following the same methodology with its growing network of clandestine surveillers of what its opponents do and say, and its encouragement of people to snitch on them, using a dedicated hotline for the purpose.
The Gestapo of the Nazi Germany (Geheimes Staatspolizei — the Secret State Police) relied on fear, torture of arrestees, and an overall willingness in the population to inform on their neighbours.
But within Germany it was never as large and onmniscient as people thought: in the medium sized city of Würzburg, for example, there were only 8 Gestapo officers; the system worked by relying on people coming to them to denounce others.
The Communist regime in East Germany, which collapsed at the of 1989, had its Ministerium für Staatssicherheit or Ministry of State Security. Interestingly the Stasi motto was Schild und Schwert der Partei (Shield and Sword of the Party). The Stasi was much larger and more pervasive than the Gestapo and it arrested 250,000 people as political prisoners during its existence. The Stasi also differed from the Gestapo in the degree to which it went recruiting informers and spies; somewhere between one in six and one in four East German citizens were Stasi informers on friends, colleagues etc. at one time or another.