National Security Agency

The National Security Agency is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence. The NSA is responsible for global monitoring, collection, and processing of information and data for foreign intelligence and counterintelligence purposes, a discipline known as signals intelligence . NSA is concurrently charged with protection of U.S. government communications and information systems against penetration and network warfare. Wikipedia*

On the C-SPAN Networks:
National Security Agency has hosted 3 events in the C-SPAN Video Library; the first program was a 1995 Speech. Most common tag: Intelligence.