Operation Coldstore

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Early history (pre-1819) Srivijaya 650–1377 Temasek, Long Ya Men, Ban Zu c.14th century Kingdom of Singapura 1299–1398 Malacca Sultanate 1400–1511 Johor Sultanate 1528–1819
British colonial era (1819–1942) Founding 1819–1826 Straits Settlements 1826–1867 Crown colony 1867–1942
Japanese Occupation (1942–1945) Fall of Singapore 1942 Sook Ching 1942 Double Tenth incident 1943
Post-war period (1945–1962) First Legislative Council 1948–1951 Maria Hertogh riots 1950 Second Legislative Council 1951–1955 Anti-National Service Riots 1954
Internal self-government (1955–1963) Hock Lee bus riots 1955 Singapore Glass Factory strikes 1960 Pulau Senang prison riots 1963
Merger with Malaysia (1963–1965) Singaporean referendum 1962 Operation Coldstore 1963 Race riots in Singapore 1964 MacDonald House bombing 1965
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Operation Coldstore was the code name for a covert anti-communist security operation that took place in Singapore on 2 February 1963, which was then an internally self-governing state within the British Empire. It led to the arrest of 113 people, who were detained without trial pursuant to the Preservation of Public Security Ordinance (PPSO).^[1]

In official accounts, the operation was a security operation "aimed at crippling the Communist open front organisation," which threatened Singapore's internal security.^[2] The operation was authorised and approved by the Internal Security Council which was composed of representatives from the British government, Singaporean government, and the Malayan Federal government.