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In page Assassination:

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The Irish Republican Army guerrillas in 1919 to 1921 killed many Royal Irish Constabulary Police intelligence officers during the Irish War of Independence. Michael Collins set up a special unit, the Squad, for that purpose, which had the effect of intimidating many policemen into resigning from the force. The Squad's activities peaked with the killing of 14 British agents in Dublin on Bloody Sunday in 1920.[citation needed]