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
Progressive Democrats governments four times, on each occasion with Fianna Fáil (1989–1992; 1997–2002; 2002–2007; 2007–2009), and also with the Green Party from 2007–2009. In 2005 Michael McDowell publicly took a firmly anti-republican position and named Gerry Adams, Martin McGuinness and Martin Ferris as members of the IRA Army Council. The convention in Irish politics at this time was not to accuse Sinn Fein politicians of being members of the Army Council, in doing so McDowell broke with convention. He said that until the IRA disbanded Sinn Fein could not be involved in government, North or South. On 7 September 2006 Mary Harney