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
Thomas Kelly (Sinn Féin politician) not join Cumann na nGaedheal along with other pro-Treaty Sinn Féin TDs in 1923, nor did he contest the 1923 general election. In 1930 he joined Fianna Fáil and was elected as a Fianna Fáil Teachta Dála (TD) at the 1933 general election for Dublin South. He remained a TD and councillor until his death in 1942. Thomas Kelly (Sinn Féin politician) Thomas Kelly (13 September 1868 – 20 April 1942), sometimes known as Tom Kelly, was an Irish Sinn Féin and later Fianna Fáil politician. He was a book and picture dealer before entering politics. He was a founder