On 21st May 2009, a group of concerned Singaporeans demonstrated against the treatment of the detainees who were detained without trial under the Internal Security Act.
On May 21st 1987, 22 young social workers, lawyers, businessmen, theatre practitioners and other professionals were detained without trial under the Internal Security Act (ISA) as part of 'Operation Spectrum', and accused of "being members of a dangerous Marxist conspiracy bent on subverting the PAP ruled government by force, and replacing it with a Marxist state." A second wave of arrests took place on June 20th the same year.
hochoonchiong. (March 10, 2013). Remembering Singapore\'s ISA Victims. Retrieved August 22, 2019, from EngageMedia Web site: https://www.engagemedia.org/Members/hochoonchiong/videos/remembering-22-singapore-victims-of-isa.