History of Sinn Féin 218. De Valera resigned and formed a new party, Fianna Fáil, on a platform of republicanising the Free State from within. He took the great majority of Sinn Féin support with him along with most of Sinn Féin's financial support from America. The remains of Sinn Féin fielded only 15 candidates and won only six seats in the June election, sinking to a level support not seen since before 1916. In the August 1927 by-election following the death of Constance Markievicz, SF's Cathal Ó Murchadha gained just 2.5% of the vote. Shortly after Vice-President and de facto leader MacSwiney announced
Sinn Féin Sinn Féin Sinn Féin ( ; ; is a left-wing Irish republican political party active in both the Republic of Ireland and Northern Ireland. The original Sinn Féin organisation was founded in 1905 by Arthur Griffith. It took its current form in 1970 after a split within the party (with the other side becoming the Workers' Party of Ireland) and has historically been associated with the Provisional Irish Republican Army (IRA). Mary Lou McDonald has been party president since February 2018. Sinn Féin is the largest nationalist party in the Northern Ireland Assembly, and the joint-largest overall (alongside the Democratic