Poland had a mass solidarity movement rise up in 1980. The USSR didn't decide to send in the military then; they were lucky.
https://en.wikipedia.org/wiki/Soviet_reaction_to_the_Polish_...
There was a lot of unrest in Poland, and general strikes. Martial law was imposed.
If you were an immigrant from Czechslovakia in a refugee camp in Austria at around that time, you'd be learning to speak Polish.