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There are a number of political parties in Ireland, and coalition governments are common. The two historically largest parties, Fianna Fáil and Fine Gael, arose from a split in the original Sinn Féin. Fine Gael is the successor of Cumann na nGaedheal, the faction that supported the 1921 Anglo-Irish Treaty, while Fianna Fáil arose from members of the anti-Treaty faction who opposed Sinn Féin's abstensionism. The division on the Treaty had also caused the Irish Civil War (1922–23), leading to the difference between the parties being described as "Civil War politics", to distinguish it from a more common left-right political divide. Fianna Fáil and Fine Gael together are sometimes pejoratively referred to as "FFG".[1][2]
As of 2023[update], Fianna Fáil and Sinn Féin jointly have the greatest representation in Dáil Éireann, followed closely by Fine Gael in third position. The Green Party surpassed the Labour Party in 2020. The Labour Party was formed in 1912, and it had usually been the third party in parliamentary strength, though it is currently the fifth largest party in the Dáil, followed closely by the Social Democrats.
The Electoral Commission maintains a Register of Political Parties under the Electoral Reform Act 2022.[3] Before the establishment of the Commission 2023, the register was maintained by the Houses of the Oireachtas.[4] To register to contest national elections a party must have either at least one member in Dáil Éireann or the European Parliament, or 300 recorded members aged 18 or over. Parties that register only to contest elections in part of the state or in local elections need only 100 recorded members aged 18 or over. In either case, at least half of the recorded members must be on the register of electors.[5]