The Internal Security Unit (ISU) was the counter-intelligence and interrogation unit of the Provisional Irish Republican Army (IRA). This unit was often referred to as the Nutting Squad, in reference to the fact that many of the informers uncovered were shot in the back of the head (the "nut").
The Internal Security Unit (ISU) was the counter-intelligence and interrogation unit of the Provisional Irish Republican Army (IRA). This unit was often referred to as the Nutting Squad, in reference to the fact that many of the informers uncovered were shot in the back of the head (the "nut").
Source: Wikipedia "Internal Security Unit" · CC BY-SA 4.0
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