Room 641A NSA Surveillance Facility

Record	OBS-0078
Category	Government/Surveillance
Status	PARTIALLY SUBSTANTIATED
Summary	Room 641A is a telecommunications interception facility in an AT&T building in San Francisco, alleged to be operated for the NSA as part of a mass surveillance program. The claim was publicly revealed by AT&T technician Mark Klein in 2006, leading to a class-action lawsuit. The facility is said to have access to all internet traffic passing through the building, enabling massive-scale surveillance.
Origin	The existence of Room 641A was revealed in 2006 by former AT&T technician Mark Klein, who had worked at the facility. The room began operations in 2003.
Claimed	Room 641A is a secret NSA-operated facility inside an AT&T building in San Francisco. It uses Narus STA 6400 devices to intercept and analyze internet traffic at high speeds. The facility has access to all internet traffic passing through the building, including domestic traffic. Similar 'black rooms' are operated at other facilities across the country. The NSA and AT&T collaborated to wiretap and data-mine Americans' communications.
Evidence / consensus	The existence of Room 641A is confirmed by whistleblower testimony and internal documents, and it is widely accepted that the NSA ran a surveillance program with telecom cooperation. However, the full scope and legality of the program remain debated; lawsuits were dismissed due to retroactive immunity granted by Congress.

> OBSERVER NOTE:
A confirmed physical tap on the internet backbone. The whistleblower's account is consistent with later NSA revelations, though the exact data handling remains classified.

Sources

Sources are external and provided for verification. Listing does not imply the Observer endorses their claims.