"In January 2003, Klein observed a new room being built adjacent to the room housing AT&T's #4ESS switching equipment, which is responsible for routing long distance and international calls.
"While doing my job, I learned that fiber optic cables from the secret room were tapping into the Worldnet (AT&T's internet service) circuits by splitting off a portion of the light signal," Klein wrote.
Klein said he came forward because he does not believe that the Bush administration is being truthful about the extent of its extrajudicial monitoring of Americans' communications."
wired.com/2006/04/whistle-blower-outs-nsa-spy-room-2/