http://www.boingboing.net/2005/11/06/patriot_act_secretsu.html
The dread PATRIOT Act created many new powers for law-enforcement, including the ability to secure the prized super-warrants called National Security Letters without judicial oversight. In the time since PATRIOT was passed, their use by the FBI has increased by 10,000 percent. Each of these warrants can be used to invade the lives of many Americans, and none of them are being issued with a judge’s oversight after presentation of evidence justifying these intrusions into the lives of private individuals. These warrants are issued on a copper’s say-so, without the due process that is the hallmarks of democracy.
How far can one FSA go? Well, in 2003, one was used to secure the records of guests in hotels in Las Vegas over a four-day period: 250,000 people (the investigation was inconclusive). The use of NSLs is common, but us hearing about them is rare: NSLs come with gag-orders that prohibit those who receive them from discussing them.
Goddamnit.