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Mark Klein, AT&T whistleblower who revealed NSA mass spying, has died

by Cindy Cohn and Corynne McSherry eff.org published 2025-03-123 min read

EFF is deeply saddened to learn of the passing of Mark Klein, a bona fide hero who risked civil liability and criminal prosecution to help expose a massive spying program that violated the rights of millions of Americans.Mark didn’t set out to change the world. For 22 years, he was a...

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