Like in Sweden

10 Terrifying Facts about the East German Secret Police
Thursday, November 14, 2019 | Laura Williams
https://fee.org/articles/10-terrifying-facts-about-the-east-german-secret-police/

1) They Were Gaslighting before It Was a Thing

The Stasi were prolific gaslighters. In the 1950s, repression was brutal, physical torture. Early in the 1970s, eager to be accepted on the international stage, the East German Secret Police had to get more subtle. The aim of Zersetzung (a repurposed military term meaning disintegration or corrosion) was to “switch off” any activist individuals and groups who might threaten the Party. Police collected medical, school, and police records, interviews with neighbors and relatives, and any other evidence they could get and would then customize a direct hit on an individual’s mental health.

If someone looked like he might challenge the Communist Party’s legitimacy or control, the Stasi systematically destroyed his life. ...

Like in Sweden, except the ruling Marxist élite were the Marxist faction of the Social Democrats. Not of the Communist party.

And not just the same methods, but partly even the same actors:

SWEDISH TEACHERS IN THE DDR – A STUDY OF A STASI PROJECT (IN SWEDISH)*
freeworldforum | Publicerad 11 March, 2015
https://frivarld.se/rapporter/swedish-teachers-ddr-study-stasi-project-swedish/

* Yes, the attached pdf, 21 pages long, is in Swedish, the English page I directly link to is only an intro.