What happened at Harvard University in 2019?

What happened at Harvard University in 2019?
Harvard University Professor and Two Chinese Nationals Charged in Three Separate China Related Cases
The Department of Justice announced today that the Chair of Harvard University’s Chemistry and Chemical Biology Department and two Chinese nationals have been charged in connection with aiding the People’s Republic of China.
https://www.justice.gov/opa/pr/harvard-university-professor-and-two-chinese-nationals-charged-three-separate-china-related