McCurtin was sentenced to ten years' imprisonment at Enniskillen assizes on 13 March 1922 for possession of firearms and ammunition, and transferred to Aberdeen prison in 1923. His brother was a commandant in the National Army, killed during the Civil War.
McCurtin was first elected to Dáil Éireann while in prison, as a Cumann na nGaedheal Teachta Dála (TD) for the Tipperary constituency at the 1923 general election. The Free State government regarded him as one of a number of political prisoners and demanded their release. The UK government undertook to review their cases, and the Northern Ireland prime minister, Sir James Craig, agreed to accept the review's conclusions. McCurtin was released with 32 others on 25 January 1926, and took his seat in the Dáil on 23 March 1926.
- "Mr. Seán McCurtin". Oireachtas Members Database. Retrieved 3 January 2009.
- HC Deb 05 March 1925 vol 181 cc616-20
- "Ceisteanna—Questions. Oral answers. - Deputy imprisoned in Scotland". Dáil Éireann debates. 13 December 1923. pp. Vol. 5 No. 23 p.3 c1809. Retrieved 21 May 2013.
- McConville, Sean (2003). Irish Political Prisoners 1848-1922: Theatres of War. Routledge. p. 768. ISBN 9780415219914. Retrieved 21 May 2013.
- "Ceisteanna—Questions. Oral Answers. - Release of political prisoners by Northern Government". Dáil Éireann debates. 9 June 1925. pp. Vol. 12 No. 5 p.3 c.479. Retrieved 21 May 2013.
- "Deputy takes his seat". Dáil Éireann debates. 23 March 1926. pp. Vol. 14 No. 16 p.32 cc.1498–99. Retrieved 21 May 2013.
- "Seán McCurtin". ElectionsIreland.org. Retrieved 3 January 2009.
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