The concept of "chilling effect"

The concept of a “chilling effect” was elaborated in the landmark case of New York Times v. Sullivan (376 U.S. 254, 1964):

We should be particularly careful, therefore, adequately to protect the liberties which are embodied in the First and Fourteenth Amendments. It may be urged that deliberately and maliciously false statements have no conceivable value as free speech. That argument, however, is not responsive to the real issue presented by this case, which is whether that freedom of speech which all agree is constitutionally protected can be effectively safeguarded by a rule allowing the imposition of liability upon a jury's evaluation of the speaker's state of mind. If individual citizens may be held liable in damages for strong words, which a jury finds false and maliciously motivated, there can be little doubt that public debate and advocacy will be constrained. And if newspapers, publishing advertisements dealing with public issues, thereby risk liability, there can also be little doubt that the ability of minority groups to secure publication of their views on public affairs and to seek support for their causes will be greatly diminished. Cf. Farmers Educational & Coop. Union v. WDAY, Inc., 360 U.S. 525, 530. The opinion of the Court conclusively demonstrates the chilling effect of the Alabama libel laws on First Amendment freedoms in the area of race relations. The American Colonists were not willing, nor should we be, to take the risk that "[m]en who injure and oppress the people under their administration [and] provoke them to cry out and complain" will also be empowered to "make that very complaint the foundation for new oppressions and prosecutions." The Trial of John Peter Zenger, 17 Howell's St. Tr. 675, 721-722 (1735) (argument of counsel to the jury). To impose liability for critical, albeit erroneous or even malicious, comments on official conduct would effectively resurrect "the obsolete doctrine that the governed must not criticize their governors." Cf. Sweeney v. Patterson, 76 U.S.App.D.C. 23, 24, 128 F.2d 457, 458.