National Security Letters and Data Mining

This is a clip from the Frontline documentary "Spying on the Home Front". PBS has the entire documentary online here: http://www.pbs.org/wgbh/pages/frontline/homefront/view/. Highly recommended. This clip in particular talks about how the Patriot Act and administration policies greatly expanded the scope of national security letters and about the massive data mining efforts on the part of the NSA, FBI, and DARPA in pursuance of many of these NSLs.

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