Even on U.S. Campuses, China Cracks Down on Students Who Speak Out

On the bucolic campus of Purdue University in Indiana, deep in America’s heartland and 7,000 miles from his home in China, Zhihao Kong thought he could finally express himself.

In a rush of adrenaline last year, the graduate student posted an open letter on a dissident website praising the heroism of the students killed in the Tiananmen Square massacre in 1989.

The blowback, he said, was fast and frightening. His parents called from China, crying. Officers of the Ministry of State Security, the feared civilian spy agency, had warned them...