Earlier this month, a former police sergeant was sentenced to 18 months in prison after he was found guilty of acting as an agent of the Chinese regime on American soil.

The man in question is former Sergeant Michael McMahon—who previously worked for the New York Police Department. After leaving the police force, however, he went into the private sector as a private investigator, and it was in this capacity that he became entangled in a Chinese Communist Party operation called “Operation Fox Hunt.”

Let’s go through the details of this case, as well as what Operation Fox Hunt is all about.