A potential espionage threat to Britain from Dublin-based Soviet agents arose as the establishment of Irish-Soviet relations became a probability. This chapter examines perceptions of the communist-influenced Official republican movement as the Troubles escalated in 1971-2, with officials expressing fears for the stability of the Dublin government – the ‘Irish Cuba’. British and American officials used a Cold War prism here. The Russians could be expected to exploit the northern crisis, the American ambassador warned, using the Official movement as their ‘natural vehicle’. Following Bloody Sunday, when British paratroopers killed thirteen unarmed civilians, the British prime minister, Ted Heath, warned Dublin that the Soviets would cause as much trouble as they could, using the Official IRA as a proxy. The Irish revolutionary left too used a Cold War lens when opposing Ireland’s membership of the European Economic Community (EEC): it would lock Ireland into a NATO-dominated bloc.