The Derry Citizen's Defense Association was organized in response to which police force known as the most dangerous police force in the world?
Royal Ulster Constabulary:  During the Troubles, 319 members of the RUC were killed and almost 9,000 injured in paramilitary assassinations or attacks, mostly by the Provisional IRA, which made, by 1983, the RUC the most dangerous police force in the world in which to serve.
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