Possible Clues:

• "Fidelity, Bravery, Integrity" org
• Their warnings open movies
• G-men's org
• "___! Open up!"
• Abscam creator
• Org. in 'The X-Files'
• ''Ten Most Wanted'' agcy
• Warning issuer at the start of a DVD
• J. Edgar Hoover ran it
• ''X-Files'' org