Mark Klein, the former AT&T technician who famously blew the whistle on secret U.S. government mass surveillance, has passed away at age 79. His death was officially confirmed by the Electronic Frontier Foundation (EFF), the digital rights organization that championed his cause.
Exposing the Secret Infrastructure of Surveillance
In 2006, Klein broke his silence by revealing classified documents that exposed the National Security Agency’s (NSA) covert operations within an AT&T facility in San Francisco. His testimony provided the first concrete evidence that the government was tapping directly into the internet’s backbone to monitor domestic communications.
Inside Room 641A
The centerpiece of Klein’s revelations was the existence of Room 641A. Inside this facility, optical splitting wiretaps were installed to create exact, real-time copies of raw internet traffic, which were then funneled directly to the NSA.
This operation confirmed long-standing suspicions that the U.S. government was harvesting the private data of millions of Americans, utilizing expanded powers granted by Congress following the September 11, 2001, terrorist attacks.
A Legacy of Digital Transparency
Klein’s decision to come forward predated the 2013 disclosures by Edward Snowden, who later leaked thousands of classified documents detailing the scale of global NSA surveillance. Following Klein’s initial disclosures, the EFF launched a legal battle against the federal government, though the case was ultimately dismissed.
The Electronic Frontier Foundation continues to honor Klein’s legacy, recognizing his pivotal role in forcing the conversation about privacy, civil liberties, and the extent of government reach into the digital lives of citizens.