China is putting political agents in charge of Hong Kong universities, to impose censorship on students and fire noncompliant professors.

Gui Minhai, the Hong Kong publisher that was kidnaped by China and then prevented from leaving China, was arrested to stop him from reaching Beijing for a medical exam at the Swedish embassy. (He is a Swedish citizen.)

It is almost impossible to travel between cities in China without being tracked. Passengers must show identification to take a train, and I think that applies also to buses. In the US, Amtrak checks the identity of passengers, which is why I refuse to use it.