Etymology
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Sinn Fein (n.)

1905, from Irish, literally "we ourselves," from Old Irish féin "self," from PIE *swei-no-, suffixed form of root *s(w)e- (see idiom). Movement founded 1905 by Irish journalist and politician Arthur Griffith (1872-1922).

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Definitions of Sinn Fein

Sinn Fein (n.)
an Irish republican political movement founded in 1905 to promote independence from England and unification of Ireland; became the political branch of the Irish Republican Army;
From wordnet.princeton.edu