The National Security Letter (NSL) provision of the PATRIOT Act was
struck down today by federal court judge Victor Marrero. The
controversial NSL provision has allowed the FBI to secretly demand
access to records held by organizations like libraries and Internet
service providers. National Security Letters, which can be used without
probable cause or judicial oversight, also impose “gag” restrictions on
recipients, forbidding them from disclosing that they have received the
letter.
http://arstechnica.com/news.ars/post/20070906-patriot-act-provision-stru
ck-down-by-federal-court.html