sentences:  Following the Irish War of Independence, Barrett supported the Anti-Treaty IRA's refusal of authority to the Dail (civil government of the Irish Republic declared in 1919).He was opposed to the Anglo-Irish Treaty, calling for the elimination of English influence in Ireland.In April 1922 under the command of Rory O'Connor, Barrett, along with 200 other hard-line anti-treaty men, took over the Four Courts building in the centre of Dublin in defiance of the new Irish government.