Senior FBI agent and mentor to O'Neill, initially suspected of sexual deviance. He is a devout Catholic who suspects he is being watched. Uncovered as a long-term spy for the Soviet Union and Russia, he is ultimately caught by the FBI after a final dead drop.
Burroughs represents the FBI's investigative force targeting Hanssen's espionage.
Formal workplace hierarchy where O'Neill poses as Hanssen's subordinate to gather intelligence.
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