". . . 1969 when the Supreme Court ruled the decision to award the First Amendment protection to the burning of the flag."
". . . Congress has made seven attempts to overrule the Supreme Court decision regarding the burning of the American flag by passing a constitutional amendment that had an exception to the First Amendment and allowed the government to ban flag desecration. The Amendment was first proposed in 1990 but failed to receive the required two-thirds majority votes of the House...."
Law Dictionary: Is Flag Burning Illegal?