book, Inside Intelligence, former SIS officer Anthony Cavendish confirms that he knew Wallace and says that his story is "frightening and disquieting, but one which ties in with many events to which I have been privy". Cavendish sent Wallace a first edition of his book which contains the following inscription: "Colin - a great help and a true friend." Cavendish, a close friend over many years of Sir Maurice Oldfield, former Chief of the Secret Intelligence Service, says that Wallace's assertion that Oldfield was the target of a black propaganda campaign by MI5, "match closely details which were told to me privately by Maurice." In his biography of Oldfield. Richard Deacon [Donald McCormick] writes: Who were Oldfield's enemies? Who wanted to hound him even in retirement and, if possible, to destroy him totally? These were questions which I felt it imperative to try to answer. I tried to track down the source of these various stories which became embroidered as time passed, but there was nothing positive one could go on other than word of mouth gossip. My information is that the first report came not from the IRA, but from an undisclosed Ulster Defence Regiment source. Later sources suggested the stories came from inside the British Army. The intelligence world in which Wallace operated in Northern Ireland was graphically described by Lord Stevens, former Commissioner of the Metropolitan Police. Stevens had presided over the Stevens Inquiries into collusion between the security forces and loyalist paramilitaries in the murders of Irish nationalists. In May 2011, he gave evidence to the Joint Committee on the Draft Detention of Terrorist Suspects (Temporary Extension) Bills and said: When you talk about Intelligence, of the 210 people we arrested, only three were not (Intelligence) agents. Some of them were agents for all four of those particular organisations (Army, MI5, MI6 and Special Branch), fighting against each other, doing things and making a large sum of money, which was all against the public interest and creating mayhem in Northern Ireland. Any system that is created in relation to this country and Northern Ireland has to have a proper controlling mechanism. It has to have a mechanism where someone is accountable for what the actions are and that has to be transparent. The Man Who Knew Too Much In 2020 a documentary was produced on the life of Colin Wallace, The Man Who Knew Too Much.