EPIC, the Electronic Privacy Information Center, has discovered a number of documents through a Freedom of Information Act request that indicate possible intelligence violations against US residents.
From the EPIC website:
Documents (pdf, 3.1 mb) obtained by EPIC under the Freedom of Information Act describe thirteen cases of possible FBI misconduct in intelligence investigations. The documents were released by the Bureau in response to an EPIC open government request (pdf) for information about the FBI’s use of provisions of the PATRIOT Act. EPIC has written a letter (pdf) to the Senate Judiciary Committee highlighting the need for the Attorney General to report to Congress on potentially unlawful intelligence investigations. For more information, see EPIC’s PATRIOT FOIA Litigation page. (Oct. 24