NSA Director Gets Heckled at Black Hat Hacker Convention (VIDEO)

The NSA head General Keith Alexander faced a hostile crowd Wednesday while attempting to defend mass surveillance programs at the Black Hat security conference in Las Vegas.

Around 30 minutes into his speech, Alexander claimed that the NSA had "stopped thirteen terrorist related activities in the United States," flashing up a slide that stated the NSA had prevented fifty-four worldwide terrorist events. "Our nation takes stopping terrorism as one of the most important things." Alexander stated, prompting a man in the crowd to shout "Freedom!"