Book excerpt recounts how AT&T whistleblower Mark Klein alerted EFF to the NSA-linked Room 641A surveillance facility

The excerpt focuses on Mark Klein, the former AT&T technician who brought evidence about Room 641A to the Electronic Frontier Foundation. The room became a symbol of alleged warrantless internet surveillance involving telecom infrastructure and U.S. intelligence agencies.

The story highlights how insider disclosures can expose hidden surveillance systems embedded in private-sector networks. It also underscores the long-running tension between national security programs and civil liberties oversight in the digital communications era.