Related Clues:

• Ness, for one
• Govt. agent
• Certain Fed
• Fed
• Fed. agent
• Crime buster
• Hoover employee, once
• Crimebuster, informally
• F.B.I. operative
• Fed of a sort
• Gangster follower
• Agent
• Hoover, for one
• Dillinger foe
• FBI employee