We may gain something in our quest for peace if we recognize at once that war is not an abnormality. In the truest sense, it is not the mere play of … - Charles Evans Hughes

Freedom of speech and of the press are fundamental rights which are safeguarded by the due process clause of the Fourteenth Amendment of the Federal Constitution. [...] The right of peaceable assembly is a right cognate to those of free speech and free press, and is equally fundamental. As this Court said in United States v. Cruikshank, 92 U.S. 542, 552:
The very idea of a government, republican in form, implies a right on the part of its citizens to meet peaceably for consultation in respect to public affairs and to petition for a redress of grievances.
The First Amendment of the Federal Constitution expressly guarantees that right against abridgment by Congress. But explicit mention there does not argue exclusion elsewhere. For the right is one that cannot be denied without violating those fundamental principles of liberty and justice which lie at the base of all civil and political institutions — principles which the Fourteenth Amendment embodies in the general terms of its due process clause. [...]
These rights may be abused by using speech or press or assembly in order to incite to violence and crime. The people, through their legislatures may protect themselves against that abuse. But the legislative intervention, can find constitutional justification only by dealing with the abuse. The rights themselves must not be curtailed. The greater the importance of safeguarding the community from incitements to the overthrow of our institutions by force and violence, the more imperative is the need to preserve inviolate the constitutional rights of free speech, free press and free assembly in order to maintain the opportunity for free political discussion, to the end that government may be responsive to the will of the people and that changes, if desired, may be obtained by peaceful means. Therein lies the security of the Republic, the very foundation of constitutional government.

Equally unavailing is the insistence that the statute is designed to prevent the circulation of scandal which tends [p722] to disturb the public peace and to provoke assaults and the commission of crime. Charges of reprehensible conduct, and in particular of official malfeasance, unquestionably create a public scandal, but the theory of the constitutional guaranty is that even a more serious public evil would be caused by authority to prevent publication. To prohibit the intent to excite those unfavorable sentiments against those who administer the Government is equivalent to a prohibition of the actual excitement of them, and to prohibit the actual excitement of them is equivalent to a prohibition of discussions having that tendency and effect, which, again, is equivalent to a protection of those who administer the Government, if they should at any time deserve the contempt or hatred of the people, against being exposed to it by free animadversions on their characters and conduct. There is nothing new in the fact that charges of reprehensible conduct may create resentment and the disposition to resort to violent means of redress, but this well understood tendency did not alter the determination to protect the press against censorship and restraint upon publication. [...] The danger of violent reactions becomes greater with effective organization of defiant groups resenting exposure, and if this consideration warranted legislative interference with the initial freedom of publication, the constitutional protection would be reduced to a mere form of words.

The exceptional nature of its limitations places in a strong light the general conception that liberty of the press, historically considered and taken up by the Federal Constitution, has meant, principally, although not exclusively, immunity from previous restraints or censorship.