Why was schenck v. US a significant court case and how did the supreme court rule?

Schenck v. United States (1919) was a significant Supreme Court case as it addressed the limits of free speech under the First Amendment during wartime. The Court ruled unanimously that Charles Schenck's anti-draft pamphlets posed a "clear and present danger" to national security, thereby justifying restrictions on free speech in certain contexts. This case established the precedent that free speech is not absolute and can be limited when it poses a significant threat to public safety or order.