Room 641A：NSA在AT&T设施的秘密监控

美国国家安全局在电信运营商AT&T位于旧金山的通信中心运营着一个秘密拦截设施。1这个名为Room 641A的设施位于旧金山611 Folsom街SBC通信大楼，规模约24×48英尺（7.3×14.6米），自2003年开始运营。1该设施配备了包括Narus STA 6400在内的设备，可以进行高速拦截和分析互联网通信。1

AT&T技术人员马克·克莱因于2006年披露了这一设施的存在。1电子前沿基金会随后提起了名为Hepting v. AT&T的诉讼，案件于2006年1月31日正式立案。1另一起诉讼Jewel v. NSA也于2008年9月18日提起。1在经过多年法律争议后，美国国会于2011年追溯性授予与政府合作的电信公司豁免权，1Hepting案最终于2011年12月29日被驳回，1Jewel案也于2019年4月25日被驳回。1

Room 641A was a telecommunications interception facility operated by the U.S. National Security Agency in partnership with AT&T, located at 611 Folsom Street in San Francisco's SBC Communications building 1. The facility, measuring approximately 24 by 48 feet, began operations in 2003 1 and was equipped with Narus STA 6400 devices capable of intercepting and analyzing internet communications at high speed 1.

The existence of Room 641A came to public attention in 2006 when Mark Klein, an AT&T technician, disclosed its operations 1. Following this disclosure, the Electronic Frontier Foundation initiated legal action, filing the case Hepting v. AT&T on January 31, 2006 1. A second lawsuit, Jewel v. NSA, was filed on September 18, 2008 1. Both cases were ultimately dismissed—Hepting v. AT&T on December 29, 2011, and Jewel v. NSA on April 25, 2019 1—after Congress retroactively granted immunity to telecommunications companies that had cooperated with the government in 2011 1.