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Singaporean leftist opposition leader Chia Thye Poh was detained under the Internal Security Act, which allows for preventive detention, and held for 32 years.

Chia Thye Poh

Singaporean former politician

Chia Thye Poh is a Singaporean former politician. A former member of the Barisan Sosialis, he was the Member of Parliament (MP) for the Jurong SMC between 1963 and 1966. He was the 4th Leader of the Opposition in 1966.
Source: Wikipedia (CC BY-SA)

Internal Security Act (Singapore)

Statute of the Parliament of Singapore

The Internal Security Act 1960 (ISA) of Singapore is a statute that grants the executive power to enforce preventive detention, prevent subversion, suppress organized violence against persons and property, and do other things incidental to the internal security of Singapore. The…
Source: Wikipedia (CC BY-SA)

Preventive detention

Detention for non-punitive reasons

Preventive detention is an imprisonment that is putatively justified for non-punitive purposes, most often to prevent further criminal acts.
Source: Wikipedia (CC BY-SA)