O’Brien (1969):  This case dealt with a content-neutral
statute (at least, that is what the Court claimed).  D (O’Brien) and
several others burned their draft cards on the steps of a federal
courthouse, as part of a protest against the war in Vietnam. They
were convicted of violating a U.S. Congressional amendment to the
draft laws making it a crime to “knowingly destroy [or] mutilate” a
draft card.  Some members of Congress had originally urged enactment
of the amendment as a way of curbing Vietnam war protest.  Did
Congress’ amendment violate D’s First Am. rights?