Sinn Féin for nine years. (It merged with two other organisations to form Fine Gael in 1933.) Anti-Treaty Sinn Féin members continued to boycott the Dáil. At a special "Ard Fheis" in March 1926, de Valera proposed that elected members be allowed to take their seats in the Dáil if and when the controversial Oath of Allegiance was removed. When his motion was defeated, de Valera resigned from Sinn Féin; on 16 May 1926, he founded his own party, Fianna Fáil, which was dedicated to republicanising the Free State from within its political structures. He took most Sinn Féin TDs with him.
History of Sinn Féin Ireland in the early 2000s. This is a summary of the splits and mergers from the initial Sinn Féin party and the IRA and their successors. History of Sinn Féin Sinn Féin (""We Ourselves"", often mistranslated as "Ourselves Alone") is the name of an Irish political party founded in 1905 by Arthur Griffith. It subsequently became a focus for various forms of Irish nationalism, especially Irish republicanism. Its splits during the Irish Civil War in 1922 and again at the beginning of the Troubles in 1969 had dramatic effects on politics in Ireland. Sinn Féin today is a republican, left-wing