Anti H-Block was the political label used in 1981 by supporters of the Irish republican hunger strike who were standing for election in both Northern Ireland and the Republic of Ireland. "H-Block" was a metonym for the Maze Prison, within whose H-shaped blocks the hunger strike was taking place. The successes of the Anti H-Block movement galvanised the Irish republican movement, and led to the entry the following year into mainstream electoral politics of Sinn Féin.