002/19-09-2007-ECCC-OCIJ ЮŲŠ / No: D427 that the CIA was conspiring with the Vietnamese to overthrow the CPK regime.585 The establishment of security centres and execution sites was therefore a key means by which the CPK did “whatever it [took] to cause the oppressed classes to be victorious over the oppressor classes”.586 181. As set out below, the list of those whom the Party suspected of engaging in activities against the State broadened and evolved over time as a result of domestic developments and the international armed conflict between Cambodia and Vietnam. The CPK considered itself under constant threat of invasion and annexation by Vietnamese forces and entered into the international armed conflict with Vietnam in pursuance of its policy to defend itself from external enemies. Dates & Participation 182. This policy was primarily carried out by members of the military and security forces (Santebal) of the CPK.587 It evolved before and throughout the regime. By the 1970s, security centres and execution sites had been established in “liberated” zones and were reeducating bad-elements and killing enemies.588 This policy was widely disseminated from 1971 and songs encouraging the “smashing” of people were used as a tool of implemention.589 183. In July 1975, at a RAK gathering, the “Chairman of the High-Level Military Committee of the Party” declared that the Revolutionary Army had to defend the country against “internal enemies” and continue “smashings”.590 During various other RAK meetings, the methods to be employed against bad elements were discussed.591 184. The Standing Committee addressed this policy during a series of meetings held between August 1975 and August 1976,592 including methods of surveillance,593 the situation of specific individuals such as Sihanouk or cadres identified as potential “traitors,”594 and the situation of national defence595 and enemies.596 185. Two Party documents, both dating from September 1975, discuss those whom the CPK suspected of engaging in activities against the State, both inside and outside Cambodia, and in some cases they propose an appropriate sanction.597 For example, it was decided that intellectuals living abroad would be reeducated through labour upon their return to the country. 598 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. 49