There is an industrial city called Baotou in Inner Mongolia Autonomous Region. Heard a story that 2 foreigners employed by a university there were caught by the PSB teaching elsewhere locally without first having asked for permission to do second jobs. Following on from their deceit:

1) - both fired
2) - both fined 10,000 RMB each
3) - both forced to leave China wiythin 10 days

Beware of Baotou PSB, they are assholes!