Captain Frederick John Holroyd is a former British soldier who was based at the British Army's 3 Brigade HQ in mid-Ulster, Northern Ireland during the 1970s. He enlisted as a gunner in the Royal Artillery, and three years later, in 1964, he was commissioned into the Royal Army Service Corps (later the Royal Corps of Transport). He volunteered for the Special Military Intelligence Unit in Northern Ireland in 1969, and he was trained at the Joint Services School of Intelligence. Once his training was finished, he was stationed in Portadown, where, for two and a half years up to 1975, he ran a series of intelligence operations. He resigned from the Army in 1976. Collusion allegations Holroyd has made several claims of collusion between the Intelligence Corps and Ulster loyalist paramilitaries during the Troubles in Northern Ireland. Holroyd was one of a number of former security force members who either exposed or admitted to such activity, the most prominent being Colin Wallace and John Weir. Holroyd also claimed that during the mid-1970s the Special Air Service (SAS) used the cover name, "4 Field Survey Troop, Royal Engineers" during operations. This modus operandi was introduced in 1973 and abandoned in 1975. Fred Holroyd claimed this was an SAS unit working undercover at the Royal Engineers' base at Castledillon, County Armagh. Holroyd said he worked with the members of this unit and that members were told that it was a NITAT (Northern Ireland Training and Tactics Team), whose personnel were "former, serving or recently trained" Holroyd claimed that the unit was made up of SAS soldiers, with the commanders being infantry officers attached to the SAS. One of these was Captain Robert Nairac, described as, "seconded to 14th Intelligence", otherwise known as 14 Intelligence Company" or '14 Int'. He also added to allegations that a cabal of right-wing British intelligence operatives from MI5 and the SIS, along with figures from the British establishment, had been involved in a plot to destabilise and overthrow British Prime Minister Harold Wilson through a secret organization known as "Group 13". The former intelligence officer Peter Wright, author of Spycatcher, was said to have been part of this group. Holroyd's allegations surfaced again in a New Statesman article written by Duncan Campbell in 1984. Holroyd's allegations helped form the basis for the 1990 Ken Loach film, Hidden Agenda. Involvement with Ken Livingstone MP Labour Member of Parliament