The Sarawak Communist Organisation was predominantly dominated by ethnic Chinese but also included Dayak supporters. However, the Sarawak Communist Organisation had little support from ethnic Malays and other indigenous Sarawak peoples. At its height, the SCO had 24,000 members. During the 1940s and 1950s, Maoism had spread among Chinese vernacular schools in Sarawak. Following the Second World War, Communist influence also penetrated the labour movement and the predominantly-Chinese Sarawak United People's Party, the state's first political party which was founded in June 1959. The Sarawak Insurgency began after the Brunei Revolt in 1962 and SCO would fight alongside the Bruneian rebels and Indonesian forces during the Indonesia–Malaysia confrontation (1963–1966).