E4A was a special intelligence unit within the Royal Ulster Constabulary (RUC). E4A was established in 1978 (?) as the RUC equivalent of 14 Intelligence Company. E4A worked in conjunction with the RUC's Headquarters Mobile Support Unit (HMSU). (see also: Headquarters Mobile Support Unit, HMSU; Royal Ulster Constabulary, RUC)
E4A
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