On 21 June we provided over 50 cases to both the House and Senate Intelligence Committees that show the specific contribution of these programs to our understanding and, in many cases, disruption of terrorist plots in the United States and over 20 countries throughout the world. These results were achieved consistent with our responsibilities under the law. A report issued by the Senate Judiciary in June 2012 emphasized that the government has implemented its intelligence authorities in a responsible manner: "Through four years of oversight, the committee has not identified a single case in which a government official engaged in willful effort to circumvent or violate the law." More than 50 disruptions with zero willful failures in the protection of civil liberties - that's an incredible record and is a testament to NSA's staunch commitment to protecting and upholding the privacy and civil liberties of the American people even as we keep our nation safe. This has been accomplished by the extraordinary people at NSA, the real heroes, working alongside our partners within the Intelligence Community.
Source: NSA. Read full article. (link)