Top FBI Agent in Chicago Testifies that U.S. Marshal Admited He "Made a Huge Mistake"

Chicago's top FBI agent testified today that a deputy U.S. marshal accused of leaking secrets to the mob admitted to federal lawmen that he "made a huge mistake."

Robert Grant is the special agent in charge of the FBI's Chicago office. He testified in the trial of John T. Ambrose, who's on unpaid leave.

Grant says that Ambrose made the admissions in an emotional confrontation.

He says Ambrose initially denied the allegations, then decided he wanted to cooperate and admitted he was friends with people he shouldn't have been.

The 42-year-old Ambrose is charged with leaking information about a key witness in the FBI's Operation Family Secrets investigation - the biggest Chicago mob case in years.

The trial is now going into its second week.

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