NSA protest stirs up memories of AT&T spying scandal

It was a walk down memory lane for Mark Klein on Tuesday night, when a crowd gathered to hear him speak out, yet again, about the secret sharing of data between a top communications company and the US government.

Klein, a retired AT&T technician, leaked several internal AT&T documents in 2006 that showed that the NSA was collecting data from AT&T through a restricted room, 641A.