Claim: The Irish Marxist Society was part of the Communist Party in Ireland and often criticized the Soviet Union.
Evidence: The Irish Marxist Society (sometimes given as the Irish Marxist Group) was a Eurocommunist organisation active in Ireland in the 1970s. The IMS was the result of a split in the Communist Party of Ireland. 
One notable split from the CPI was the Eurocommunist grouplet the Irish Marxist Society, which left the CPI around 1976.