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
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