Related Clues:

• F.B.I. investigator, slangily
• I.R.S. agent, e.g.
• U.S. Treasury agent
• ATF agent, e.g.
• Hoover was one
• F.B.I. agent
• Counterfeiter chaser
• Gangster chaser
• ATF agent, once
• 'The X-Files' extra
• Federal agent, for short
• Dillinger's pursuer
• Bureau member
• Government agent, slangily
• Hood catcher