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Huh? Chinese citizens are free to apply to jobs in the Western world, and most companies are happy to hire them. Also, while the Chinese intelligence apparatus undoubtedly has easier access to Chinese nationals, the vast majority of these workers are not a part of a state-run syndicate to circumvent sanctions (or worse).

The NK thing is a fundamentally different scenario: you have people you're not allowed to hire lying to you and stealing identities to get hired. That's an obvious problem in itself, and the fact that it's orchestrated by the NK government to benefit the regime is only making it worse.

There are other parties that probably do the same, but NK is the industry leader, so to speak.