Summary

Frank Murphy Thornhill v. Alabama — Opinion of the Court

But no clear and present danger of destruction of life or property, or invasion of the right of privacy, or breach of the peace can be thought to be inherent in the activities of every person who approaches the premises of an employer and publicizes the facts of a labor dispute involving the latter. We are not now concerned with picketing en masse or otherwise conducted which might occasion such imminent and aggravated danger to these interests as to justify a statute narrowly drawn to cover the precise situation giving rise to the danger.
Source: Wikisource

Frank Murphy Thornhill v. Alabama — Opinion of the Court

But the group in power at any moment may not impose penal sanctions on peaceful and truthful discussion of matters of public interest merely on a showing that others may thereby be persuaded to take action inconsistent with its interests. Abridgment of the liberty of such discussion can be justified only where the clear danger of substantive evils arises under circumstances affording no opportunity to test the merits of ideas by competition for acceptance in the market of public opinion.
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature