The man who won the right to discuss his National Security Letter (2011)
http://www.onthemedia.org/2013/jan/04/national-security-letters-and-gag-orders/From January 2011, but well worth a re-listen today. This highlights one of the problems with government secrecy. National Security Letters come with a gag order that keeps the recipient from even discussing receipt of the letter with their lawyer.