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Joe Cahill (19 May 1920 – 23 July 2004) was a prominent figure in the Irish republican movement in Northern Ireland and former chief of staff of the Provisional Irish Republican Army (IRA). He joined a junior-republican movement, Na Fianna Eireann, in 1937 and the following year, joined the Irish Republican Army. In 1969, Cahill was a key figure in the founding of the Provisional Irish Republican Army. Wikipedia