Barisan Sosialis (Malay; Chinese: 社会主义阵线), or the Socialist Front was a now defunct political party in Singapore. It was formed on 29 July 1961 and officially registered on 13 August 1961 by left-wing members of the People's Action Party (PAP), who had been expelled from the PAP. The prominent founding members of the Barisan Was Dr Lee Siew Choh . It became the biggest opposition party in Singapore during the 1960s and the 1980s. The main objectives of the Barisan included eradicating colonialism and establishing a united independent and democratic Malayan nation comprising the Federation of Malaya and Singapore, and introducing an economic system to promote the prosperity and stability of the society. The party was merged into the Workers' Party of Singapore in 1988.