“Submitting your passport” is a management measure that has gradually tightened within the Chinese Communist Party’s system in recent years. The logic behind it is that personnel in key positions, like civil servants, teachers, doctors, bank and state-owned enterprise employees, and military personnel, are seen as ‘critical roles.’ The official reason is to avoid capital outflows or political risks.
Source: China Shuts Itself Off, Suddenly Seizes Passports on a Massive Scale, Reverts to Mao Era!
