Exclusive: Mystery Court Challenge Sheds Light on Pervasive Patriot Act Power: In 2010 the FBI issued more than 24,000 national security letters to ISPs and other companies, demanding they hand over information on more than 14,000 customers. The letters come with a built-in gag order that prohibits the company from disclosing to customers or anyone else that it has even received an NSL. But thanks to a challenge launched by a recent recipient, we know of at least one NSL that was served on a company this year.
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