A part of the patriot act was ruled unconstitutional essentially because it was too vague and conflicted with the rights to free speech and association.

http://www.democracynow.org/article.pl?sid=04/01/27/1555205
http://www.cnn.com/2004/LAW/01/27/patriot.act/

The interview in the Democracy Now article mentions that the “Library provision” of the patriot act is currently being challenged in a case in Detroit. The library provision says the government can request records from any business entity on any person just by saying it’s related to national security, as well as placing the providers of the information under a gag order.