From the Wall Street Journal this morning:

The effect of the new national-security law that China imposed on Hong Kong is extending far beyond the territory to American college campuses.

Classes at some elite universities will carry a warning label this fall: This course may cover material considered politically sensitive by China. And schools are weighing measures to try to shield students and faculty from prosecution by Chinese authorities.

At Princeton University, students in a Chinese politics class will use codes instead of names on their work to protect their identities. At Amherst College a professor is considering anonymous online chats so students can speak freely. And Harvard Business School may excuse students from discussing politically sensitive topics if they are worried about the risks.