The Constitution (Amendment No. 17) Act 1931 (act no. 37 of 1931, previously bill no. 40 of 1931), popularly called the Public Safety Act 1931, was an Act of the Oireachtas of the Irish Free State amending the Constitution of the Irish Free State. It inserted Article 2A which empowered the Executive Council to declare a state of emergency during which most provisions of the constitution could be suspended and extra security measures taken. These measures included the uses of the Constitution (Special Powers) Tribunal, a military tribunal, to try civilians for political offences, granting extra powers of search and arrest to the Garda Síochána (police), and the prohibition of organisations deemed a threat to the state's security.