Related Clues:

• U.S. global monitor
• 'Snowden' subj
• Code breaking org
• Govt. org. that offers a monthly 'Puzzle Periodical'
• Org. employing codebreakers
• Grp. in the Oscar-winning documentary 'Citizenfour'
• 'Sneakers' org
• 'Crypto City' at Ft. Meade
• Org. with a Trafficthief database
• Org. whose budget is classified
• Former Snowden employer, briefly
• Ultra-secret org
• Secretive government org
• Org. with a CryptoKids website
• Org. that's the subject of 'The Puzzle Palace'