How did the supreme courts decision in sch neck v US affect free speech?

The Supreme Court's decision in Schenck v. United States (1919) established the "clear and present danger" test, which limited free speech during wartime. Charles Schenck was convicted for distributing leaflets opposing the draft, and the Court ruled that speech could be restricted if it posed a significant threat to national security. This ruling set a precedent for future cases, emphasizing that free speech is not absolute and can be curtailed under certain circumstances.