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You may know that the NSA are not supposed to carry out surveillance against American citizens, as per US Signals Intelligence Directive 18, unless given special permission by the Attorney General. You may also know that the Supreme Court has ruled that the NSA cannot spy against US citizens. They used to get around this by working with GCHQ in the UK—GCHQ would spy on Americans, the NSA would spy on the English, and they’d exchange data.