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
Sinn Féin Bank founding council comprised George W. Russell, Arthur Griffith, and P. T. Daly. In 1910 it purchased headquarters at 6 Harcourt Street for £575, leasing the upper floors to the Sinn Féin party, from where the "Sinn Féin" newspaper was edited. A contemporary wrote, "we do not envy the man who has the job of persuading [nationalists] that the new Sinn Fein bank (which we take it will be established without complying with the requirements of British law) is a secure nest for his savings as the Bank of Ireland". When the First Dáil proclaimed an Irish Republic in 1919, it