Related Clues:

• FBI agent
• Certain agt.
• FBI operative
• F.B.I. guy
• FBI guy
• Undercover type
• FBI worker
• Fed, e.g.
• F.B.I. investigator, slangily
• ATF agent, e.g.
• Hoover was one
• F.B.I. agent
• Gangster chaser
• 'The X-Files' extra
• Federal agent, for short