National Security Agency

Founded November 4, 1952.

Budget-wise, the NSA is the largest single American government agency, though the exact budget itself is classified.

NSA security awareness poster:

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• wiki: National_Security_Agency
• wiki: NSA_warrantless_surveillance_controversy
• EFF: How the NSA’s Domestic Spying Program Works
• NSA Security Awareness Posters
• NSA: Print and Construct Your Own Cipher Disk