of Bantam Books, deciding that the commission's blacklisting practice constituted an unlawful prior restraint on free expression in violation of the First Amendment. The Court held that any system of prior censorship on publications "strikes at the very foundation of freedom of expression" and cannot be enforced unless regulated by precise rules with procedural safeguards. This was an influential decision reinforcing First Amendment protections against government censorship of published materials.

In 1964, Grosset & Dunlap acquired full