In the first test of its kind since the Sept. 11 attacks, the Supreme Court will consider today whether a federal law that bars support to designated terrorist groups violates First Amendment rights of free speech and association.

The crux of the case, which pits First Amendment values against government anti-terrorist efforts, is whether the law that traces to 1996 and was amended by the 2001 USA Patriot Act is so poorly defined that it criminalizes pure speech.
Court considers whether terror law violates free speech - USATODAY.com