Mark Klein

Mark Klein is an American whistleblower and former AT&T technician who gained notoriety for revealing in 2006 that AT&T was cooperating with the National Security Agency (NSA) to conduct warrantless surveillance on internet communications. He disclosed the existence of a secret facility at an AT&T data center that routed user data, raising concerns about privacy and government overreach. Klein's revelations contributed to an ongoing debate about surveillance, civil liberties, and the balance between national security and individual rights in the digital age. His actions highlighted the implications of technology on personal privacy and the importance of accountability in government practices.