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
Thomas Kelly (Sinn Féin politician) 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 member of Sinn Féin and was elected to Dublin City Council. Kelly was arrested after the 1916 Easter Rising and sent to prison in England, and after becoming seriously ill, he was released back to Dublin. He was elected as a Sinn Féin MP for the Dublin St Stephens's Green constituency at the 1918 general election. In