"Billy Boys" originated in the 1920s as the signature tune of the Brigton Boys, also called The Billy Boys of Brigton Cross, who were a Protestant street gang in Bridgeton (an area of Glasgow historically associated with the city's Protestant population, and with Scottish unionism - "Brigton" is the Scots form of Bridgeton) led by Billy Fullerton. The gang often clashed with Roman Catholic gangs such as the Norman Conks and the Calton Tongs. Fullerton was a member of the British Fascists who was awarded a medal for strike-breaking during the 1926 General Strike and formed a Glasgow branch of the British Union of Fascists with the onset of World War II. The "Billy Boys" song was often sung loudly when the gang performed it. They regularly sang it when they marched through primarily Catholic areas of Glasgow on Catholic holy days. This often led to the Brigton Boys being attacked by members of the Norman Conks as a result. Despite being primarily based in Glasgow, in the 1930s the Brigton Boys were invited to march in Belfast and sang "Billy Boys" while they were there as part of The Twelfth celebrations.