What Klein uncovered was Room 641A, a secret NSA installation within AT&T's central office. The room contained equipment that made copies of all data passing through the company's networks ...

explaining how NSA used a splitter for all internet traffic flowing through San Francisco, rerouting everything to a room at AT&T called 641A. Klein told PBS Frontline in 2007 about the day in ...

Room 641A, has been referred to in recent reports about surveillance activities within the U.S. The Room, which can only be accessed by National Security Agency personnel, is said to collect ...

Behind the door of the now-infamous Room 641A, optical splitting wiretaps were creating an identical copy of raw internet traffic and funneling it back to the NSA. Klein's disclosure was ...

Klein himself had to install fiber optic splitters and lay the branched lines to room 641A. This was the first time it was publicly established that the NSA was also eavesdropping on the data of ...

Klein went public in 2006 with documents revealing that the NSA was using a secret room in an AT&T hub in San Francisco to tap into the backbone of the internet. Behind the door of the now-infamous ...