John Minchillo/AP
- Charles McGonigal pleaded guilty on Tuesday to working with a sanctioned Russian oligarch.
- The former FBI agent was once a top counterintelligence chief.
- He admitted to money laundering and violating sanctions.
Charles McGonigal, the FBI's former chief New York City spyhunter, pleaded guilty on Tuesday to working with a sanctioned Russian oligarch.
McGonigal pleaded guilty to one count of money laundering and conspiracy to violate sanctions.