Internal Security Act[edit]
Main article: Internal Security Act (Singapore)
The Ministry of Home Affairs Internal Security Department enforces the country's Internal Security Act (ISA) as a counter to potential espionage, international terrorism, threats to racial and religious harmony, and subversion. The ISA permits indefinite detention without formal charges or recourse to trial, and has been used to imprison political opponents, including Chia Thye Poh, who was held for 32 years without trial before being released. As of 2005, 36 men were being held under the ISA.[2]