Story time...
I went to graduate school at Pitt. My graduate program specialized in both international affair's degrees and a Master's of Public Administration. The American students were diversified, some of us got International Affairs, or economics degrees. The Chinese, well they all went straight for the MPA. Unfortunately, Pitt has gotten a reputation in China that it is an excellent place to come and get your MPA. Year after year, hundreds flock in to get an MPA degree and then they flee back to China to work for their government. An MPA degree from an American university is highly desired by the Communist government.
The fall semester of my second year, a few friends of mine were paid a visit by the FBI. The FBI was asking questions about an apparent Chinese student in my program. I wasn't surprised. He spoke English better than most of the others and was quite chummy with Americans. I don't know if anything ever happened with their investigation. I continued to see the student around, but we all kept our distance. But one thing that was made apparent to us was our graduate program was well known to the FBI. Apparently, there were easily a few Chinese spies in each and every graduating class.