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4 August – The 4th PAP Party Conference was held. Six left-wing members were elected to the 12-member Central Executive Committee.[7]
6 August – Lee Kuan Yew and five other right-wing PAP CEC members does not recognize the results of the 4th Party Conference and refused to resume office.[8]
13 August – The PAP left-wing took over key post of the CEC, ending the week old crisis.[9]
21-22 August – Chief Minister Lim Yew Hock launched a series of anti-communist mass arrests under the Preservation of Public Security Ordinance known as Operation Apple. About 35 people were detained including the five of the newly elected CEC members and 13 branch officials of the PAP.[10][11]
October
20 October – A new Central Executive Committee of the PAP is formed with Toh Chin Chye as Chairman and Lee Kuan Yew as Secretary-General.[12]
November
1 November – The Citizenship Ordinance in 1957 commenced with registration of Singapore citizenship.[13]
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