Correct. "It is a demand letter issued to a particular entity or organization to turn over various record and data pertaining to individuals. They require no pr

Correct. "It is a demand letter issued to a particular entity or organization to turn over various record and data pertaining to individuals. They require no probable cause or judicial oversight." http://en.wikipedia.org/wiki/National_security_letter http://en.wikipedia.org/wiki/National_security_letter Anyone who wants to watch a documentary largely about these letters should watch Spying On The Homefront by PBS Frontline (you can watch it online): http://www.pbs.org/wgbh/pages/frontline/homefront/ http://www.pbs.org/wgbh/pages/frontline/homefront/