FBI Director Robert Mueller

Army Gen. Keith Alexander, commander of U.S. Cyber Command, director of the National Security Agency and chief of the Central Security Service, speaks at the Armed Forces Communications and Electronics Association's International Cyber Symposium on June 27, 2013 in Baltimore, Md. (credit: Win McNamee/Getty Images)

NSA Director: ‘No One Has Willfully Or Knowingly Disobeyed The Law Or Tried To Invade Your Civil Liberties’

The heads of the nation’s three top intelligence agencies said Thursday they strive to protect Americans’ privacy in an evolving era of cybersecurity threats, electronic surveillance and concerns about government data-monitoring.