The Army Comrades Association (ACA), later the National Guard, then Young Ireland and finally League of Youth, but better known by the nickname The Blueshirts (), was a paramilitary organisation in the Irish Free State in the early 1930s. The group provided physical protection for political groups such as Cumann na nGaedheal from intimidation and attacks by the anti-Treaty IRA. Some former members went on to fight for the Nationalists in the Spanish Civil War after the group had been dissolved.