Internal Security Unit

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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.

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

Duties

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The group was believed to have had a number of briefs:

Security and character vetting of new recruits to the IRA,
Collecting and collating material on failed and compromised IRA operations,
Collecting and collating material on suspect or compromised individuals (informers),
Interrogation and debriefing of suspects and compromised individuals,
Carrying out killings and lesser punishments of those judged guilty by IRA courts martial.

The ISU was believed to have unlimited access to the members, apparatus and resources of the IRA in carrying out its duties. Its remit could not be countermanded except by order of the Army Council.

Depositions obtained as part of its operation would ideally be noted on paper, and if possible recorded for the purposes of propaganda.

Activity

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The ISU carried out debriefing of IRA volunteers following their detention by security forces operating in Northern Ireland. These interviews would take place to discover if a volunteer had betrayed information or secrets of the organisation. They would also take place in the event of an operation, weapons cache, or unit being exposed to danger or uncovered.

The membership of the IRA and wider republican community were expected to comply with requests for information made by the ISU, this information then being used to build or refute accusations made against an IRA volunteer.

References

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This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (December 2017) (Learn how and when to remove this message)

Further information/sources

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Ingram, Martin with Greg Harkin. "Stakeknife". Britain's secret agents in Ireland", O'Brien Press, 2004.

External links

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"Victims were sacrificed by agent known as 'Stakeknife'", irishnews.com, 22 October 2015; accessed 3 August 2017.
Scappaticci profile, theguardian.com, 12 May 2003.
"It's time ordinary republicans stopped being led like sheep" - Ingram interview with the Sunday Tribune, cryptome.quintessenz.org, 19 February 2006.
Lengthy Interview given by Martin Ingram on Radio Free Éireann describing his FRU activities" NOTE, the interview begins after twenty-five minutes

Provisional Irish Republican Army

General

Organisation

Actions

1970–1979	Battle of St Matthew's Falls Curfew 1970 Crossmaglen bombing Scottish soldiers' killings Red Lion bombing Balmoral showroom bombing Abercorn bombing Donegall Street bombing Battle at Springmartin Battle of Lenadoon Bloody Friday Claudy bombing Newry customs bombing Old Bailey bombing Honey Trap killings King's Cross & Euston bombings Coleraine bombings 1973 Westminster bombing M62 bombing Clogher attack Houses of Parliament bombing Tower of London bombing Guildford pub bombings Harrow School bombing Brooks's Club bombing Woolwich pub bombing British Airways bombing attempt Birmingham pub bombings London pillar box bombings Talbot Arms bombing Bristol bombing Telephone exchange bombings 1974 Oxford Street bombing Carlton Tower & Portman Hotel shootings Mountainview attack Bayardo Bar attack Forkhill attack Caterham Arms bombing Tullyvallen massacre London Hilton bombing Piccadilly bombing Trattoria Fiore bombing Scott's Oyster Bar bombing Walton's Restaurant bombing Drummuckavall ambush Balcombe Street siege Kingsmill massacre West Ham station attack Olympia bombing Store bar shooting Stag Inn attack Garryhinch ambush Jonesborough Gazelle downing La Mon restaurant bombing Crossmaglen ambush Warrenpoint ambush Brussels bombing Dungannon attack
1980–1989	Dunmurry train bombing Lough Foyle attacks Glasdrumman ambush 1981 Bessbrook attack Chelsea Barracks bombing Hyde Park & Regent's Park bombings Harrods bombing Royal Artillery Barracks bombing Brighton hotel bombing Ballygawley land mine attack Newry mortar attack Ballygawley attack Enniskillen mortar attack RUC Birches barracks attack Rheindahlen bombing Loughgall ambush Operation Flavius Corporals killings Lisburn bombing Aughanduff Lynx shootdown 1988 Netherlands attacks Glamorgan barracks bombing Inglis Barracks bombing Ballygawley bus bombing Jonesborough ambush Clive Barracks bombing Deal barracks bombing Mayobridge attack Derryard attack
1990–1991	Derrygorry Gazelle downing South Armagh sniper Downpatrick roadside bomb Operation Conservation 1990 Wembley bombing Carlton Club bombing London Stock Exchange bombing Honourable Artillery Company bombing Lichfield gun attack RFA Fort Victoria bombing Proxy bombings Downing Street mortar attack Paddington & Victoria station bombings Mullacreevie ambush Glenanne barracks bombing Coagh ambush Musgrave Park Hospital bombing Crumlin Road Prison bombing
1992–1997	Teebane bombing Clonoe ambush London Bridge bombing Staples Cnr bombing Baltic Exchange bombing Sussex Arms bombing Cloghoge attack Coalisland riots Forensic Science Laboratory bombing Stoke Newington Road bomb 1992 Manchester bombing Night of the Long Knives 1993 Harrods bombing Warrington bombings Cullaville occupation Camden bombing Bishopsgate bombing Finchley Road bombings Battle of Newry Road Shankill Road bombing 1993 Fivemiletown ambush Heathrow attacks Crossmaglen Lynx downing Drumcree conflict Docklands bombing Aldwych bus bombing 1996 Manchester bombing Hammersmith Bridge bombing Osnabrück mortar attack Thiepval barracks bombing Coalisland attack 1997 Northern Ireland riots

Personalities
(Volunteers)

Espionage and
Supergrasses

Eamon Collins
Denis Donaldson
Joseph Fenton
Kevin Fulton
Raymond Gilmour
Martin McGartland
Sean O'Callaghan
Freddie Scappaticci (allegedly "Stakeknife")

Associates

Derivatives

Prominent
killings

Duties

Activity

See also

References

Further information/sources

External links