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
Benjamin Fein held by Fein and rival Joseph Rosenzweig in which a large shootout took place on Grand Street and Forsyth Street lasting several hours, although few were killed, beginning the New York Labor slugger war that would last almost four years. Arrested for assault in 1914, Fein agreed to testify against several members involved in labor slugging when his political connections refused to help Fein resulting in the indictments of eleven gangsters and 21 union officials; however, none would be brought to trial. That same year Fein was again arrested for the murder of court clerk Frederick Strauss, who was killed