The question is at the heart of an ongoing court battle between the Federal Bureau of Investigations and two communications service providers represented by the Electronic Frontier Foundation. EFF is representing CREDO Mobile and Cloudflare in their efforts to defend themselves against the use of the controversial national security letters (NSL).
Do ‘National Security Letters’ Violate The 1st Amendment?
National security letters are so wrought with potential for abuse that EFF describes them as “one of the most frightening and invasive” facets of the PATRIOT Act.