Answer: Hecklers veto.
Step-by-step explanation:
Legally speaking, a heckler's veto refers to a restriction of a speaker's right to avoid a reaction from another party, such as the prohibition of a demonstration based on the expected adverse response of those opposed to it.
In 1977, a group of Holocaust survivors obtained an injunction banning a National Socialist Party of America's march. However, in June 1978 the courts ruled in favor of the nazi organization´s freedom of speech and assembly, protected by the First Amendment.