[Chaebixi]

> It's the new Soviet internal passport system.

China already has that, the Hukou, and has for some time.

https://en.wikipedia.org/wiki/Hukou_system

[seanmcdirmid]

Ya, Hukou is just on another level of crazy. But since the mid 2000s, internal migration has been allowed without any hard constraints, you just can’t access social services (like schools) as locals can. Well assuming you aren’t a Uighur.