The Supreme Court upheld the conviction of David Paul O'Brien for burning his draft card in violation of a federal statute. While O'Brien claimed his act was protected symbolic speech, the Court found that the statute furthered substantial government interests in maintaining an efficient draft system and did not violate O'Brien's First Amendment rights since he knew his act was illegal. The statute was intended to prevent the destruction of draft cards and ensure their continued availability, which facilitated communication between registrants and local boards.