The Irish Republican Socialist Movement (IRSM) is an umbrella term for:
the Irish Republican Socialist Party (IRSP), a Marxist–Leninist Irish republican political party formed in 1974 following a split in Official Sinn Féin. the Irish National Liberation Army (INLA), the paramilitary wing of the IRSP. the Republican Socialist Youth Movement (RSYM), the youth wing of the IRSP. the Irish Republican Socialist Committees of North America, the representation of the IRSM in North America.
References