RIP Mark Klein. He exposed NSA's secret surveillance program in notorious Room 641A

By Mark Klein - https://sites.google.com/site/markklein2009/Home, CC BY-SA 3.0, Link

The Electronic Frontier Foundation (EFF) recently announced the passing of Mark Klein, the AT&T whistleblower who exposed the NSA's mass surveillance program nearly two decades ago.

Klein worked as a telecommunications technician at AT&T for 22 years when he discovered so…