What Supreme Court justice first set out the four-pronged test?
U.S. Supreme Court Chief Justice Earl Warren wrote the majority opinion in the case of United States v. O’Brien that established the four-pronged test, since known as the O’Brien test, for determining whether regulation of symbolic speech violates the First Amendment.References:Law Library: American law and legal information: United States v. O’Brien – Significance, Draft Card BurningFirst Amendment Center: United States v.