Christopher John Hanna, was a prison officer who held a senior position inside the Maze Prison, Northern Ireland. In June 1990 he was sentenced to life imprisonment at Maghaberry for helping the Provisional IRA kill colleague Brian Armour two years previously. He was also accused by former Ulster Defence Association (UDA) leader Andy Tyrie of complicity in UDA South Belfast brigadier John McMichael's death in 1987. McMichael was blown up by a bomb placed underneath his car. According to Tyrie, Hanna gathered information about McMichael when the latter visited loyalist inmates. Hanna in his turn passed on the information to local Belfast actress Rosena Brown, with whom Hanna was infatuated. Brown, dubbed the "IRA Mata Hari", served as an intelligence officer of the IRA. Hanna also passed on information about Armour to Brown, who was named at Hanna's trial.

John McMichael was a Northern Irish loyalist who rose to become the most prominent and charismatic figure within the Ulster Defence Association (UDA) as the Deputy Commander and leader of its South Belfast Brigade. He was also commander of the "Ulster Freedom Fighters" (UFF), a cover name for the UDA, overseeing an assassination campaign against prominent republican figures whose details were included in a notorious "shopping list" derived from leaked security forces documents. The UDA used the UFF name when it wished to claim responsibility for attacks, thus allowing it to remain a legal paramilitary organisation until August 1992 when it was proscribed by the British Government.