 Lennon had sympathies for the Roman Catholic Irish minority in Northern Ireland and had joined a protest in London on 11 August 1971 that attempted to pressure the British government into removing its troops from Northern Ireland, shortly before Lennon moved to New York.On 30 January 1972 at a protest march in Derry, 13 marchers were killed by members of the 1st Battalion, Parachute Regiment.The killing was quickly dubbed "Bloody Sunday".