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(Updated: January 19, 2018) Since the start of the Snowden-revelations, we not only learned about the various collection programs and systems of the National Security Agency (NSA), but also about the various legal authorities under which the agency collects Signals Intelligence (SIGINT). Bceause these rules are rather complex, the following overview will show which laws and regulations govern the operations of the NSA, showing what they are allowed to collect where and under which conditions. Also mentioned are various collection programs that run under these authorities. The overview provides a general impression of the most important elements of the various laws and regulations and does not pretend to be complete in every detail. For example, provisions for emergency collection are not included. Also, some of these laws and regulations govern the work of other US intelligence agencies too, but here the focus is on the NSA. Collection INSIDE the US: Targeted collection - US persons

On July 24, the US National Archives released a series of 356 never-before-seen photos, most of them taken on September 11, 2001 inside the emergency bunker under the White House. The bunker is officially called the Presidential Emergency Operations Center (PEOC), but White House officials also call it the shelter. It was constructed in 1942 underneath the East Wing of the White House, which was primarily built to cover the building of the bunker. It is said the PEOC can withstand the blast overpressure from a nuclear detonation. One of the very few photos from inside the PEOC available before the recent release (White House photo - Click to enlarge) The photos were released in response to a Freedom of Information Act (FOIA) request filed by Colette Neirouz Hanna, coordinating producer for the FRONTLINE documentary film team. They focus on the reaction from then-vice president Dick Cheney and other Bush administration officials during the terrorist attacks. How Cheney reached