Newly disclosed National Security Agency documents show that the U.S. government’s relationship with telecom giant AT&T has been considered “unique and especially productive,” according to a joint investigation by the New York Times and ProPublica published Saturday.

The news organizations, whose team of journalists included Laura Poitras and James Risen, report that AT&T’s cooperation has involved a broad range of classified activities. The revelations are based on a trove of documents provided to the Times and ProPublica by NSA whistleblower Edward Snowden.

AT&T has given the NSA access, “through several methods covered under different legal rules,” to billions of emails, metadata records, and cellphone call records as they have flowed across its domestic networks, according to the reporting. 

“The NSA’s top-secret budget in 2013 for the AT&T partnership was more than twice that of the next-largest such program, according to the documents,” the investigation revealed. “The company installed surveillance equipment in at least 17 of its Internet hubs on American soil, far more than its similarly sized competitor, Verizon. And its engineers were the first to try out new surveillance technologies invented by the eavesdropping agency.”

The direct link to AT&T isn’t explicit in the documents, as the corporate partnerships are referred to by code names. However, an analysis of “Fairview” program documents by the Times and ProPublica “reveals a constellation of evidence that points to AT&T as that program’s partner,” the article states. Several former intelligence officials confirmed that finding.

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