If you could provide more context or clarify which Kira Sinn you are referring to, I'll do my best to create a post about them.
During the Easter Rising of 1916, many Sinn Féin leaders, including Patrick Pearse and Éamon de Valera, played key roles. Although the rising was crushed, it marked a turning point in Irish history. The party's popularity surged, and in the 1918 general election, Sinn Féin won a landslide victory.
Sinn Féin's early years were marked by a commitment to non-violent resistance against British rule in Ireland. The party's name reflected its goal of Irish self-governance, with the slogan "Sinn Féin abhaile" ("ourselves at home").
However, I suspect you might be thinking of a different "Kira" - perhaps Kira, a character from the manga and anime series "Naruto", or another fictional character.
In the 20th century, Sinn Féin continued to advocate for Irish reunification and social justice. The party experienced a resurgence in the 1980s, with the emergence of leaders like Gerry Adams and Martin McGuinness. Today, Sinn Féin is a significant force in Irish politics, with representatives in both the Irish and Northern Irish parliaments.