I saw a news report last year about some Chinese students that got arrested. They had been taught Marxism, solidarity with workers, class struggle, etc at University, then tried to put that into practice. They protested against unsafe working practices for cleaners and cooks, campaigned for workers rights and ended up getting arrested and sent to jail for challenging the very system that educated them to do this in the first place. Apparently it wasn't just an isolated incident and things like that happen from time to time.
https://www.washingtonpost.com/world/asia_pacific/if-i-disap...