Gitlow v. New York

http://en.wikipedia.org/wiki/Gitlow_v._New_York

The Supreme Court previously held, in Barron v. Baltimore, 32 U.S. 243 (1833), that the Constitution's Bill of Rights applied only to the federal government, and that, consequently, the federal courts could not stop the enforcement of state laws that restricted the rights enumerated in the Bill of Rights. Gitlow v. New York's partial reversal of that precedent began a trend toward nearly complete reversal; the Supreme Court now holds that almost every provision of the Bill of Rights applies to both the federal government and the states.