During USSR, it was illegal in Russia to live in your parent's basement. Like you would have actually ended up in jail for living off you parents. The reasons for that:
1. There were no basements in Soviet Russia.
2. Russians lived in housing owned by government. Usually sharing it with other families. Therefore, allowing your manchild to live in a government owned flat was a felony, and waste of government resources.
3. Lenin once said: if you don't work, then you don't eat (i.e. you die).
Having no official employment is still a felony in Belarus, which is a big friend of Russia and didn't even renamed KGB.
Just think about it! Russians believe that being a manchild is a crime and during Stalin could even got you executed for sabotage:
https://vlad-radoff.livejournal.com/212928.html