The Workers' Party , originally known as Official Sinn Féin, is a Marxist–Leninist political party in Ireland. The party originated out of Sinn Féin (which was founded in 1905) and the IRA, as the split took place with the Provisionals within the republican movement at the onset of the Troubles in 1969–70. The Officials' founders were Cathal Goulding and Tomás Mac Giolla.