There's a story in the Daily Mail about the Military Reaction Force, a unit set up by Brigadier Frank Kitson to conduct 'counter-terrorist' operations in 1970s Belfast. An insider had told the Mail how the unit carried out a policy of assassinations against 'IRA suspects', which broadened to include the general civilian population. At least 20 people were shot as a result of such operations in the period 1972-4. It's not clear who all of the victims were as the MRF used weapons more commonly associated with paramilitaries, e.g. Thompson submachinegun. The former assassin refers specifically to shootings at pubs in nationalist districts of Belfast, the details of which the Mail knows but does not publish. Being the Mail the story is couched in gung-ho 'taking the terrorists on at their own game' or 'operating on the very edge of the law' type terms - but it's clear their source has been engaged in random gun-attacks on unarmed civilians.
The 'murder and mayhem' squad: Shocking new revelations by former undercover soldier who carried out 'shoot first, ask questions later' attacks on IRA terrorists for the British Army | Mail Online
I encourage people to register on the Daily Mail website and point out their obligation to report such crimes - up to and including murder - to the relevant investigating authorities.
On a separate note, BBC Panorama is apparently to show a documentary on the MRF in the new year.