Who is Kenneth Williams? The FBI agent, who authored the now-famous “Phoenix memo” and who testified behind closed doors before three congressional committees this week, remains the Soviet ...

FBI: Former colleagues say Kenneth Williams, who warned of Muslim extremists at flight schools, had a gift for counterterrorism.

Williams is working with a law firm representing families’ of 9/11 victims as they sue Saudi Arabia, accusing the country of aiding the hijackers.

The bureau's Radical Fundamentalist Unit, headed by Supervisory Special Agent Dave Frasca, and its Osama bin Laden Unit, first got a memo that Phoenix FBI agent Ken Williams sent in early July.

Ken Williams was investigating al-Qaida sympathizers who were studying civil aviation before 9/11. A serial arsonist in Phoenix took him off the case.

In court he identified himself as the FBI's lead agent in Arizona on the case of the Pentagon attack, and said he had been working on Islamic terrorism for 11 years.

An FBI agent has pleaded guilty to stealing from targets during raids and arrests, including from a man who was part of the mob that invaded the Capitol on Jan. 6, 2021.

The federal government became scrutinized when former Phoenix FBI agent Ken Williams’ ‘Phoenix memo’ became public with alarming details.