Mark Klein was a veteran AT&T technician in 2002 when he began to see what he thought were suspicious connections between that telecommunications giant and the National Security Agency...Now Mr. Klein and a few company documents he saved have emerged as key elements in a class-action lawsuit filed against AT&T on Jan. 31 by a civil liberties group, the Electronic Frontier Foundation. The suit accuses the company of helping the security agency invade its customers' privacy. |