BBC - Spotlight on the Troubles - A Secret History - 4 of 8

Tells the story of the spiral of Northern Ireland into violence in the late 1960s, the attempts of the British Government to get control of the situation, the growth of the provisional IRA, the murky relationship between the security forces and Loyalist paramilitaries and the long, tortuous path to to the end of the violence after almost three thousand deaths over a period of a quarter of a century of violence.

At the end of the Seventies, the IRA built its own internal security system to root out informers. But British intelligence found a fatal flaw that unlocked many of the IRA's secrets.

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