Clearly that NSA was conducting secret information using the network of domestic largest telecommunications company

U.S. National Security Agency (NSA) gathered various information such as mail, web browsing and social media by secretly using the data facility of AT & T , the largest telecommunications company in the United States, and the American net media · The Intercept reports.

The NSA's Hidden Spy Hubs in Eight US Cities
https://theintercept.com/2018/06/25/att-internet-nsa-spy-hubs/

AT & T owns the largest network in the world and as of March 2018 it is said that about 197 petabytes of data are exchanged in one business day. It has been previously reported that NSA has been collecting and monitoring large-scale information in cooperation with AT & T since 1985, but I did not know how it was done in concrete terms .

The Intercept identified the data center operated by a subsidiary of AT & T located in the center of Manhattan in New York, USA in 2016 as a monitoring facility of the NSA . The report by The Intercept is a further investigation based on internal documents provided by Mr. Edward Snowden and is based on AT & T in Chicago, Dallas, Atlanta, Los Angeles, New York, San Francisco, Seattle, Washington DC, USA It is clarifying that NSA was collecting communication data at data facility.

The monitoring program of NSA is codenamed "SAGUARO" within AT & T, and by NSA surveillance software " Xkeyscore " whose existence was revealed by Mr. Snowden in 2015, the monitoring program on the network such as e-mail and web traffic I was able to search the data freely.

The Intercept reports that exchange of data between AT & T and other networks is under the control of AT & T at a third-party data center owned and operated by a California state enterprise. Collected data is shared across nationwide data centers through eight AT & T data centers utilized by NSA. Mark Klein, who worked as an engineer for 22 years at AT & T, said, "By monitoring networks connected mainly at eight data centers, NSA was collecting AT & T's network and other company's network data I testify that.

Furthermore, when The Intercept requested comments from Sprint , Telia , Tata Communications , Telecom Italia , Deutsche Telekom in cooperation with AT & T's global network, there was no reply, CenturyLink said, "Discussion on national security issues Do not do it. "