Internal Security Unit

The Internal Security Unit (ISU) was the name given to the counter-intelligence and interrogation unit of the Provisional Irish Republican Army (IRA). This unit was often referred to as the Nutting Squad.

The unit is thought to have had jurisdiction over both Northern and Southern Command of the IRA, (encompassing the whole of Ireland), and to have been directly attached to IRA General Headquarters (GHQ).

Read more about Internal Security Unit:  Duties of The ISU, Examples of ISU Activity

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