I saw this story some months ago on 60 Minutes where they reported on several Chinese-American scientists (including Prof. Xi) who were wrongly accused of illegally transferring sensitive information to China. This was a significant over-reaction to actual illegal transfers of information that had happened some years earlier.
I also note that a friend and colleague of mine is a biochemist who happens to be Chinese-American and works on understanding the molecular mechanisms by which various anti-cancer chemotherapy drugs work. He has a lab in the US and a lab in China. Some of his Chinese graduate students come to his lab in the US to do some of the work. He has not been targeted as Prof. Xi (and other have been). The simple reason is that no potential national security related technology is involved. Physics has been considered to have lots of potential national security issues (historically - radar, nuclear fission & fusion, lasers, etc.). Biological sciences less so (of course we do have the examples of production of acetone by fermentation and penicillin - WWI and WWII, respectively).
Anyway, the government is NOT purging Chinese-American scientists from cancer research.
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