10 years on: End detentions at Guantánamo Bay. How 9/11 Completely Changed Surveillance in U.S. Mark Klein took this picture of the entrance to Room 641A in AT&T's building on Folsom Street in San Francisco.
The room housed internet spying equipment Klein says was installed by the NSA. Former AT&T engineer Mark Klein handed a sheaf of papers in January 2006 to lawyers at the Electronic Frontier Foundation, providing smoking-gun evidence that the National Security Agency, with the cooperation of AT&T, was illegally sucking up American citizens’ internet usage and funneling it into a database. The documents became the heart of civil liberties lawsuits against the government and AT&T.