"Northern Irish politician" . "1939Z"^^ . "Seamus Costello"@en . . . "Wicklow County Councillor" . "Seamus Costello (Irish: S\u00E9amus Mac Coisdealbha, 1939 \u2013 5 October 1977) was a leader of Official Sinn F\u00E9in and the Official Irish Republican Army and latterly of the Irish Republican Socialist Party (IRSP) and the Irish National Liberation Army (INLA).He argued for a combination of socialist politics on economic issues and traditional physical force Irish republicanism. He is best remembered for the founding of the IRSP and the INLA."@en . . "1977-10-05Z"^^ . . . "Costello, Seamus"@en . . "1977Z"^^ .