Mark Klein

March 13th 2025

Mark Klein in the 2007 PBS Frontline episode "Spying on the Home Front" (left) and door revealed to be an NSA spying room at AT&T in the mid-2000s.

Mark Klein, AT&T Whistleblower Who Exposed NSA’s Mass Surveillance, Dies at 79

Before Edward Snowden, Mark Klein blew the whistle on NSA internet spying.

Privacy & Security Matt Novak Mar 13

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