Michael O'Flanagan States in April 1925 to help Sinn Féin contest a number of by-elections. That summer he was suspended from clerical duties and forbidden to say mass because of his nationalist activities and anti-clerical speeches he had made in America. In March 1926, the Sinn Féin ard fheis narrowly defeated de Valera's proposal to enter the Free State Oireachtas if the Oath of Allegiance were removed. O'Flanagan sided with the majority. De Valera left to found Fianna Fáil, which eclipsed Sinn Féin at the June 1927 election. O'Flanagan remained with the reduced Sinn Féin. Bishop Coyne died in July 1926, but
Fianna Fáil other members split from Sinn Féin when a motion he proposed—which called for elected members to be allowed to take their seats in Dáil Éireann if and when the controversial Oath of Allegiance was removed—failed to pass at the Sinn Féin Ard Fheis in 1926. The party adopted its name on 2 April of the same year. While Fianna Fáil was also opposed to the Treaty settlement, it rejected abstentionism, instead aiming to republicanise the Irish Free State from within. The party's platform of economic autarky had appeal among the farmers, working-class people and the poor while alienating more affluent