The SAS agent who has been hailed as a hero by some & a lawless maniac by others behind some of the worst atrocities during he mid 70's of the Troubles, linked to things like the Kingsmill massacre to the Dublin and Monaghan bombings.
until he got caught he had a very good run from around 71 - 76 getting a number of top IRA men when his cover was finally blown when he walked into a Republican pub (something he would regularly do to gather int. on Republicans) in South armagh & gave his name of that as a Official IRA man who had just died.
Those who call him a hero attribute this to his bringing to justice of some high profile IRA figures while operating dangerously deep in enemy territory
The ones who say he was a maniac are some high profile British Army members who say he organized the Dublin bombings & other massacres like kingsmill & the Miami showband killings because he was against the 75 ceasefire & wanted inflame sectarian tensions (he was a Catholic himself) & he was also involved with the Clockwork Orange operation, a military coup that would go ahead if Labor pulled out of Ireland & overthrow the government.