For the Fourth Amendment protects people, not places. What a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection. But what he seeks to preserve as private, even in an area accessible to the public, may be constitutionally protected.

The First Amendment guarantees liberty of human expression in order to preserve in our Nation what Mr. Justice Holmes called a "free trade in ideas." To that end, the Constitution protects more than just a man's freedom to say or write or publish what he wants. It secures as well the liberty of each man to decide for himself what he will read and to what he will listen. The Constitution guarantees, in short, a society of free choice.

In fact, a fundamental interdependence exists between the personal right to liberty and the personal right to property.

The right to defy an unconstitutional statute is basic in our scheme. Even when an ordinance requires a permit to make a speech, to deliver a sermon, to picket, to parade, or to assemble, it need not be honored when it's invalid on its face.

To force a lawyer on a defendant can only lead him to believe that the law contrives against him.

It must always be remembered that what the Constitution forbids is not all searches and seizures, but unreasonable searches and seizures.

These death sentences are cruel and unusual in the same way that being struck by lightning is cruel and unusual.