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I haven't read it yet, but what you are saying made me think of this. I don't think the travel restrictions within the soviet union are that well known.

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Also makes me think of the still-existent Hukou system.

I've read even international passports date only to WW1.

Hukou is just for state benefits -- and that certainly has implications. But there is nothing stopping you from getting on a train to visit your aunt who lives 4 hours away.

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