Classic statement of the modern free speech position albeit delivered as a concurring judgment. Whitney itself is no longer good law. The case is of particular interest for the argument concerning the level of harm that a society must face before the right to free speech is abridged.
Brandeis J said,
‘Miss Whitney was convicted of the felony of assisting in organizing, in the year 1919, the Communist Labor Party of California, of being a member of it, and of assembling with it. These acts are held to constitute a crime, because the party was formed to teach criminal syndicalism. The statute which made these acts a crime restricted the right of free speech and of assembly theretofore existing. The claim is that the statute…denied to Miss Whitney the liberty guaranteed by the Fourteenth Amendment.
The felony which the statute created is a crime very unlike the old felony of conspiracy or the old misdemeanor of unlawful assembly. The mere act of assisting in forming a society for teaching syndicalism, of becoming a member of it, or assembling with others for that purpose is given the dynamic quality of crime. There is guilt although the society may not contemplate immediate promulgation of the doctrine. Thus the accused is to be punished, not for attempt, incitement or conspiracy, but for a step in preparation, which, if it threatens the public order at all, does so only remotely. The novelty in the prohibition introduced is that the statute aims, not at the practice of criminal syndicalism, nor even directly at the preaching of it, but at association with those who propose to preach it.
Despite arguments to the contrary which had seemed to me persuasive, it is settled that the due process clause of the Fourteenth Amendment applies to matters of substantive law as well as to matters of procedure. Thus all fundamental rights comprised within the term liberty are protected by the federal Constitution from invasion by the states. The right of free speech, the right to teach and the right of assembly are, of course, fundamental rights…These may not be denied or abridged.
But, although the rights of free speech and assembly are fundamental, they are not in their nature absolute. Their exercise is subject to restriction, if the particular restriction proposed is required in order to protect the state from destruction or from serious injury, political, economic or moral. That the necessity which is essential to a valid restriction does not exist unless speech would produce, or is intended to produce, a clear and imminent danger of some substantive evil which the state constitutionally may seek to prevent has been settled…
It is said to be the function of the Legislature to determine whether at a particular time and under the particular circumstances the formation of, or assembly with, a society organized to advocate criminal syndicalism constitutes a clear and present danger of substantive evil; and that by enacting the law here in question the Legislature of California determined that question in the affirmative. …The Legislature must obviously decide, in the first instance, whether a danger exists which calls for a particular protective measure… The powers of the courts to strike down an offending law are no less when the interests involved are not property rights, but the fundamental personal rights of free speech and assembly.
This court has not yet fixed the standard by which to determine when a danger shall be deemed clear; how remote the danger may be and yet be deemed present; and what degree of evil shall be deemed sufficiently substantial to justify resort to abridgment of free speech and assembly as the means of protection. To reach sound conclusions on these matters, we must bear in mind why a state is, ordinarily, denied the power to prohibit dissemination of social, economic and political doctrine which a vast majority of its citizens believes to be false and fraught with evil consequence.
Those who won our independence believed that the final end of the state was to make men free to develop their faculties, and that in its government the deliberative forces should prevail over the arbitrary. They valued liberty both as an end and as a means. They believed liberty to the secret of happiness and courage to be the secret of liberty. They believed that freedom to think as you will and to speak as you think are means indispensable to the discovery and spread of political truth; that without free speech and assembly discussion would be futile; that with them, discussion affords ordinarily adequate protection against the dissemination of noxious doctrine; that the greatest menace to freedom is an inert people; that public discussion is a political duty; and that this should be a fundamental principle of the American government. They recognized the risks to which all human institutions are subject.
But they knew that order cannot be secured merely through fear of punishment for its infraction; that it is hazardous to discourage thought, hope and imagination; that fear breeds repression; that repression breeds hate; that hate menaces stable government; that the path of safety lies in the opportunity to discuss freely supposed grievances and proposed remedies; and that the fitting remedy for evil counsels is good ones. Believing in the power of reason as applied through public discussion, they eschewed silence coerced by law-the argument of force in its worst form. Recognizing the occasional tyrannies of governing majorities, they amended the Constitution so that free speech and assembly should be guaranteed.
Fear of serious injury cannot alone justify suppression of free speech and assembly. Men feared witches and burnt women. It is the function of speech to free men from the bondage of irrational fears.
To justify suppression of free speech there must be reasonable ground to fear that serious evil will result if free speech is practiced. There must be reasonable ground to believe that the danger apprehended is imminent. There must be reasonable ground to believe that the evil to be prevented is a serious one. Every denunciation of existing law tends in some measure to increase the probability that there will be violation of it. Condonation of a breach enhances the probability. Expressions of approval add to the probability. Propagation of the criminal state of mind by teaching syndicalism increases it. Advocacy of lawbreaking heightens it still further.
But even advocacy of violation, however reprehensible morally, is not a justification for denying free speech where the advocacy falls short of incitement and there is nothing to indicate that the advocacy would be immediately acted on. The wide difference between advocacy and incitement, between preparation and attempt, between assembling and conspiracy, must be borne in mind. In order to support a finding of clear and present danger it must be shown either that immediate serious violence was to be expected or was advocated, or that the past conduct furnished reason to believe that such advocacy was then contemplated.
Those who won our independence by revolution were not cowards. They did not fear political change. They did not exalt order at the cost of liberty. To courageous, selfreliant men, with confidence in the power of free and fearless reasoning applied through the processes of popular government, no danger flowing from speech can be deemed clear and present, unless the incidence of the evil apprehended is so imminent that it may befall before there is opportunity for full discussion. If there be time to expose through discussion the falsehood and fallacies, to avert the evil by the processes of education, the remedy to be applied is more speech, not enforced silence. Only an emergency can justify repression. Such must be the rule if authority is to be reconciled with freedom. Such, in my opinion, is the command of the Constitution. It is therefore always open to Americans to challenge a law abridging free speech and assembly by showing that there was no emergency justifying it.
Moreover, even imminent danger cannot justify resort to prohibition of these functions essential to effective democracy, unless the evil apprehended is relatively serious. Prohibition of free speech and assembly is a measure so stringent that it would be inappropriate as the means for averting a relatively trivial harm to society… The fact that speech is likely to result in some violence or in destruction of property is not enough to justify its suppression. There must be the probability of serious injury to the State. Among free men, the deterrents ordinarily to be applied to prevent crime are education and punishment for violations of the law, not abridgment of the rights of free speech and assembly.
…Whenever the fundamental rights of free speech and assembly are alleged to have been invaded, it must remain open to a defendant to present the issue whether there actually did exist at the time a clear danger, whether the danger, if any, was imminent, and whether the evil apprehended was one so substantial as to justify the stringent restriction interposed by the Legislature…
Mr. Justice HOLMES joins in this opinion.’
[Edited and formatted for ease of reading]. You can find this case on Westlaw.