Khrushchyovka
en.wikipedia.org
en.wikipedia.org
Anyway: I digress. The worse of these units are pretty torrid but the best of them, at the time built were probably better than many working people had in the west. Of course they were rapidly superceded by significantly worse and worse forms, and housing in the UK (the only one I know) got better, mostly.
Recent stories suggest the current owners and occupants are torn between realists who are going to get on, and some people who feel a sense of dislocation and fear being de-housed into significantly worse conditions in private housing for (somebody elses) profit.