Early one morning in March 1985, as he climbed the six steps of Margaret Thatcher's prime-ministerial jet on the runway of RAF Aldergrove, little did Willie Carlin know the role Freddie Scappaticci played in saving his life. So began the dramatic extraction of Margaret Thatcher's key undercover agent in Sinn Féin - Willie Carlin, aka Agent 3007. For 11 years the former British soldier worked alongside former IRA commander Martin McGuinness in the republican movement's political wing in Derry. He was MI5's man at McGuinness' side and gave the British State unprecedented insight into the IRA leader's strategic thinking. Carlin worked with McGuinness to develop Sinn Féin's election strategy after the 1981 hunger strike, and the MI5 and later FRU agent's reports on McGuinness, Adams and other republicans were read by the British Cabinet, including Margaret Thatcher herself
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