A person's mere propinquity to others independently suspected of criminal activity does not give rise to probable cause to search that person.

I shall not attempt further to define the kinds of material I understand to be embraced within that shorthand description (of pornography), and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that.

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

Ethics is knowing the difference between what you have a right to do and what is right to do.

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.

A person's mere propinquity to others independently suspected of criminal activity does not give rise to probable cause to search that person.

Newspapers, television networks, and magazines have sometimes been outrageously abusive, untruthful, arrogant, and hypocritical. But it hardly follows that elimination of a strong and independent press is the way to eliminate abusiveness . . .