 Complete the following phrase:  In Belfast, the loyalist Shankill Butchers gang, led by Lenny Murphy, began an 18-month killing spree designed to strike terror into the Catholic community, who they believed were giving succour to the IRA. The gang would drive around Catholic areas in a black taxi and kidnap random Catholic passersby, then torture and hack them to death. However, most tit-for-tat attacks were bombings and shootings targeting pubs, or roadside ambushes, as in the case of the Miami Showband massacre. This saw three members of the popular Irish cabaret band shot dead at a fake military checkpoint by UVF gunmen in British Army uniforms. Two of those convicted were Ulster Defence Regiment UDR soldiers. Investigations established that UVF Mid-Ulster Brigade commander Robin Jackson was the 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 