Sinn Féin: From a fringe revolutionary movement to the dominant force in Irish politics

Cultures · Published 29 September 2026 Swipe more like this →

In short: Meaning we ourselves, Sinn Féin has evolved from a small 1905 nationalist group into a major political power across Ireland. Once synonymous with armed struggle and abstentionism, the party now leads the Northern Ireland Assembly and serves as the primary opposition in the Republic of Ireland’s parliament.

Founded by Arthur Griffith in 1905, Sinn Féin initially advocated for an Anglo-Irish dual monarchy. Its trajectory shifted dramatically after the 1916 Easter Rising, transforming into a vehicle for republicanism. The party’s history is defined by deep fractures, most notably the 1922 split over the Anglo-Irish Treaty, which led to the Irish Civil War and the eventual rise of Fianna Fáil. For decades, the remaining Sinn Féin organisation struggled with marginalization and a lack of parliamentary representation.

The modern era of the party began with the 1970 split, which saw the emergence of the Provisional Sinn Féin. During the Troubles, the party was widely associated with the Provisional Irish Republican Army. Under the leadership of Gerry Adams, who became president in 1983, the party adopted the ballot and Armalite strategy. This approach prioritized electoral politics while maintaining a militant stance, eventually leading to the 1998 Good Friday Agreement and the party's integration into the Northern Ireland Executive.

Sinn Féin’s evolution is marked by the abandonment of long-held policies. In 1986, it ended its abstentionist policy for the Dáil Éireann, and in 2007, it voted to support the Police Service of Northern Ireland. Today, under president Mary Lou McDonald, the party holds significant influence. In 2022, it became the largest party in the Northern Ireland Assembly, and in 2024, Michelle O'Neill became the first Irish nationalist First Minister of Northern Ireland. Despite this success, the party maintains its policy of abstentionism regarding the British House of Commons.

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