002/19-09-2007-ECCC-OCIJ ЮŲŠ / No: D427 administrative functions, and other matters such as food production, personnel, and training, but was also under the control of the Standing Committee for its duties in regard to security.1836 Duch reiterated on numerous occasions that from March 1976 to 15 August 1977, his superior was Son Sen, who was replaced by Nuon Chea from that date until the regime ended. Relations between Duch and his superiors are set out in detail in the section of the Closing Order regarding Nuon Chea. 422. S-21 was a very important security centre in Democratic Kampuchea: it was considered to be an organ of the Communist Party of Kampuchea (“CPK”); its management reported to the highest echelons of the Party; it conducted activities on a national scale, and senior-level cadres and important prisoners were held there.1837 Arrests and detentions Composition of the Incarcerated Population 423. According to the revised prisoners list, at least1838 12,273 persons are known to have been detained at S-21.1839 5,994 were reported to be male, 1,698 female and 89 children.1840 424. The majority of prisoners were Cambodian. The most prominent group was former RAK members (5,609 entries in the revised prisoners list). The purges within the military often led to RAK members of all ranks being sent to S-21. Former RAK members detained at S-21 originated from Divisions 164, 170, 174, 290, 310, 450, 502, 503, 801 and 920, as well as from independent regiments 152, 377 and 488. Personnel from the General Staff were likewise sent to S-21.1841 The evidence also shows that 156 S-21 personnel were imprisoned at S-21. Furthermore, it appears that at least 47 S-24 personnel were sent to S-21.1842 425. The second largest group of detainees was composed of CPK cadres (4,371 entries in the revised prisoners list).1843 It appears that the following zone secretaries were detained at S-21: Ruos Nheum (June 1978);1844 Men San alias Ya (September 1976);1845 and Klang Chap alias Se (August 1978). Members of the Standing Committee included: Vorn Vet (November 1978);1846 and Kung Sophal alias Keu alias Kan (November 1978).1847 Finally, secretaries of autonomous sectors included: Bou Phat alias Hang (June 1978);1848 Born Nan alias Yi (June 1978);1849 Pa Phal alias Sot (February 1977);1850 and the former Minister of Propaganda, Hu Nim (April 1977).1851 Extraordinary Chambers in the Courts of Cambodia, National Road 4, Choam Chao, Dangkao Phnom Penh Mailing address: P.O. Box 71, Phnom Penh; Tel: +855(0)23 218914 Fax: +855(0) 23 218941. 110