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
Constance Markievicz went on hunger strike. Within a month, she was released. She left Sinn Fein and joined the new Fianna Fáil party on its foundation in 1926, chairing the inaugural meeting of the new party in La Scala Theatre. In the June 1927 general election, she was re-elected to the 5th Dáil as a candidate for Fianna Fáil, which was pledged to return to Dáil Éireann, but died only five weeks later, before she could take her seat. Her fellow Fianna Fáil TDs signed the Oath of Fidelity to King George V and took their seats in the Dáil on 12