Potter Stewart,
A Quantity of Copies of Books v…
“ Any system of censorship, injunction, or seizure may of course to some extent serve to trammel, by delaying distribution or otherwise, freedom of expression; yet so may the threat of criminal prosecution, as this Court noted in Kingsley Books. The bringing of a criminal charge may result in a cessation of distribution during litigation, since even an accused relatively confident of the unlikelihood or impermissibility of conviction may well refuse to take the added risk of further criminal penalties that might obtain if he guesses wrong and continues to disseminate the questionable materials. ”
