Leader of Sinn Féin joined opposing sides with De Valera leading the Anti-Treaty faction, while Griffith joined the Pro-Treaty faction, which later became Cumann na nGaedheal. De Valera’ successor John J. O'Kelly was one of four leaders who served for brief periods of time as Sinn Féin’s party membership declined in favour of Fianna Fáil and Fine Gael. In 1937, Margaret Buckley became the first female President of Sinn Féin. During her thirteen years as leader, she vastly improved the relations between the IRA and the party. She was succeeded by Paddy McLogan and Tomás Ó Dubhghaill who both helped rebuild party support in
Elections in Northern Ireland at which nationalists failed to gain any seats. 1959 The nationalist vote fell dramatically (it would take until February 1974 to regain the heights it had reached in 1955), and Sinn Féin failed to hold the seats they had won in 1955. Both their MPs had been disqualified shortly after election anyway. 1955 Sinn Fein contested the full range of seats and united the nationalist vote behind them, winning both the seats won by nationalists in 1951. Labour candidates contested only the four Belfast seats. 1951 This was the last election at which candidates stood unopposed; four Unionist candidates in