On June 4, 1920, the Allies and Hungary signed the Treaty of Trianon, which concluded peace between the two sides after World War I. The treaty cost Hungary 72% of its territory, which went primarily to Romania, Czechoslovakia, and the Kingdom of Serbs, Croats and Slovenes.

On June 4, 1928, in Olmstead v. United States, the US Supreme Court decided that wiretapping private telephone conversations to secure evidence was permissible.

Learn more about the history surrounding the case and view the text of the decision.