Prosecutors say China is forcing Chinese nationals in the U.S. to return home to face charges. Three men, including an ex-NYPD officer, all living in the U.S., have been convicted of various charges including stalking and harassing a Chinese exile.

The trial is centered around Operation Fox Hunt, an effort by Beijing to pressure expatriates into returning home. China has denied trying to force people back to China through intimidation and said the U.S. is smearing its effort to fight crime.

The accused, a former New York City police sergeant and two Chinese citizens, took part in scare tactics aimed at former Wuhan city official Xu Jin.