 A former high-ranking FBI official has been arrested over his ties to a sanctioned Russian oligarch.Charles McGonigal, a former special agent in charge of counterintelligence in the FBIs New York Field Office, was arrested Saturday upon arriving at JFK Airport from a trip to Sri Lanka and charged with violating U.S. sanctions by trying to get Oleg Deripaska off the sanctions list, law enforcement sources told ABC News.The 54-year-old McGonigal, who retired in 2018, is one of the highest-rankin... 