organizer and main gunman in the July 1975 ambush. Described as "the most notorious Loyalist paramilitary in Northern Ireland", it was also revealed that he was a Royal Ulster Constabulary (RUC) Special Branch agent. A further 50 paramilitary attacks have been linked to Jackson, including the 1974 Dublin and Monaghan bombings, which killed 33 people. In January 1976, the UVF killed six members of two Catholic families in a co-ordinated attack. The following evening, IRA members (using the covername "Republican Action Force") retaliated by shooting eleven Protestant men after ordering them out of a minibus. Only one survived. Loyalists sought revenge, and members of the UVF Mid-Ulster Brigade planned to attack a nearby Catholic primary school. The operation was aborted by the UVF leadership on the grounds that it was "morally unacceptable", would provoke a terrible response from the IRA and could spark civil war. Harold Wilson announced on 16 March 1976 that he was resigning as British Prime Minister. That same day, the British Army defused a 200-pound IRA bomb left outside a garage in Dungannon. The bombing The Hillcrest Bar (now McAleer's) on Dungannon's Donaghmore Road, was a pub frequented by Catholics and was jointly owned by a Catholic and a Protestant. An incendiary device had been planted inside the premises the year before. On the evening of 17 March 1976, the pub was packed with revelers celebrating Saint Patrick's Day. There was also a disco for young people being held in a school across the road. According to writer and former British soldier Ken Wharton, a loyalist attack had been anticipated in Northern Ireland as 'Catholic pubs' would be packed with people enjoying the Irish holiday. Earlier that day in East Belfast, Catholic teacher John Donnelly had been drinking in the Cregagh Inn on Woodstock Road. When one of his former students identified him as a Catholic, UDA members who happened to be in the pub forced him outside (in full view of the customers) and stabbed him to death behind the building. That evening, UVF members parked a green Austin-Healey 1100 car outside the Hillcrest Bar. It had been stolen in Armagh nine days earlier. At 8.20 pm, the time bomb hidden in the car exploded. The blast killed three people outright and fatally wounded another.<ref>Llywelyn, Morgan "1999; A year of the Celtic Tiger and the Search For Peace. pp. 190-91</ref> Almost 50 people were injured,