25 disclosed one such FISA warrant to support his charge. It was issued by Judge Roger Vinson of the FISA court on April 25, 2013 and ordered Verizon to turn over to the FBI all its billing records of landline customers for the next 90 days. The FBI presented this FISA authorization to the NSA, which acts as a service organization for the FBI and CIA in collecting communications data. The NSA, with the FISA warrant in hand, then obtained the Verizon billing records. Snowden also provided the Washington Post and Guardian with another secret document, which was actually a power point presentation on 20 slides by the NSA to other intelligence agencies. It described a program it was using for monitoring the Internet. Its code name was PRISM. It was authorized under Section 702 of the Foreign Intelligence Surveillance Act and was designed to collect messages sent over the Internet from foreigners. Since most of the Internet pipes that carried these messages ran through the United States, the NSA intercepted a large part of the data from Internet companies based in America. This program was not entirely secret from the Internet companies. Such information was in fact obtained with FISA court approval and with the knowledge of the service providers. It also requires a written directive from both the Attorney General and the Director of National Intelligence, and a review by the Department of Justice every three months of each case. After obtaining this data, the NSA ran programs to filter out all domestic Internet communications. In theory at least, PRISM targeted foreign communications, but, as Snowden pointed out, domestic information was also accidently picked up. Whenever the Justice Department actually opened an investigation against Americans in contact with foreign suspects, as it did in 170 cases in 2013, it could obtain warrants from the FISA court to search these Americans’ Internet activities. So though PRISM supposedly was a tool for foreign surveillance, it co