World Socialist Party (Ireland)
The World Socialist Party (Ireland), founded as the Socialist Party of Ireland in 1949 before changing its name a decade later, was a Marxist political party in the impossibilist tradition. It was a companion party of the World Socialist Movement (WSM) and was closely connected to the Socialist Party of Great Britain (SPGB).
Source: Wikipedia — World Socialist Party (Ireland) (CC BY-SA 4.0)