10 Famous Corporate Whistleblowers in Publicly-Traded Companies

6. Mark Klein and AT&T Inc (NYSE:T) (2006)

Up next on our list of famous corporate whistleblowers in publicly-traded companies is Mark Klein, a communication technician at AT&T who unveiled the existence of a black room, 641A in a building at 611 Folsom Street in San Francisco. The room housed the internet backbone that had access to all Internet traffic under warrantless surveillance by the NSA which was illegal. AT&T was subjected to a 2006 class action lawsuit by the Electronic Frontier Foundation.

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