Farewell to a Privacy Pioneer: Mark Klein’s Legacy Against Mass Surveillance
EFF mourns the loss of Mark Klein, a hero who exposed NSA spying. As an AT&T technician, he revealed the secret Room 641A, uncovering the government’s mass surveillance. Despite personal risks, Mark’s bravery inspired change and awareness. His legacy endures as EFF continues to fight against illegal surveillance.

Hot Take:
Mark Klein: The man who dared to poke the bear of mass surveillance and emerged as a bonafide hero, reminding us all that sometimes it takes a retired technician to reveal the wires of Big Brother’s secret lair. Rest in peace to the man who took ‘telecom technician’ and turned it into ‘privacy warrior’.
Key Points:
- Mark Klein, a former AT&T technician, exposed a massive NSA spying operation that violated Americans’ privacy rights.
- He provided crucial evidence, including over 100 pages of AT&T schematics, which showed how data was siphoned into a secret NSA room.
- Klein’s revelations led to two significant lawsuits against the NSA: Hepting v. AT&T and Jewel v. NSA.
- Despite threats from AT&T, Klein’s courage inspired reforms and increased public awareness about mass surveillance.
- The fight against illegal surveillance continues, with the EFF advocating for further reforms as the law authorizing such activities expires in 2026.
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