The National Security Letter spy tool has been uncloaked, and it’s bad

The National Security Letter (NSL) is a potent surveillance tool that allows the government to acquire a wide swath of private information—all without a warrant. Federal investigators issue tens of thousands of them each year to banks, ISPs, car dealers, insurance companies, doctors, and you name it. The letters don't need a judge's signature and come with a gag to the recipient, forbidding the disclosure of the NSL to the public or the target.
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