cadres, revolutionary masses, students, and revolutionary teachers." Despite this, Kang Sheng soon found that the calamitous red wave that overtook Mao's China would grow beyond his control. It wouldn't be until October 1978, after Mao's death in September 1976, that Hua Guofeng and Wang Dongxing would rebuild the Central Investigative Department which was officially reestablished on 28 July 1978. The organization still lacked experience or established tradecraft which would cause them a number of embarrassments. Vietnamese invasion of Cambodia The most impactful embarrassment of the newly reestablished Central Investigative Department (or Diaochabu) was their inability to predict the Vietnamese invasion of the Republic of Kampuchea (today Cambodia) in 1979. Following a visit to Democratic Kampuchea by Wang Dongxing in early November 1978, he and head of the new Central Investigative Department Luo Qinchang praised the ten-year friendship with the Khmer Rouge and helped Kaing Khek and Ta Mok to establish the neighboring communist party's notorious S-21 interrogation and extermination camp where around 20,000 Cambodians would be killed under Pol Pot's genocide. Within a month of Wang and Luo's return to China, the Socialist Republic of Vietnam launched a full-scale invasion of Kampuchea in response to a series of border attacks on the Liberation Army of Kampuchea. Perhaps by ideological closeness to Pol Pot and his followers, Chinese intelligence under the Central Investigative Department, and consequently PRC leadership, was caught by surprise by the Vietnamese invasion. Unable to contact the Khmer Rouge who, under the leadership of Ta Mok, had escaped into the jungles to organize a guerrilla resistance with only one Chinese agent carrying a defective satellite radio, a thousand Chinese military advisors fled Cambodia via Thailand and left 4,000 civilian advisors to the invading Vietnamese army. Compounding the intelligence failure, as the invasion broke the Central Investigative Department expressed confidence to Chinese leaders that the invasion would be easily repelled and that the Chinese embassy in the capital, Phnom Penh, would be unharmed. Hoping to force a Vietnamese withdrawal from its ally Cambodia, the People's Republic of China launched their own southward invasion across the border into Vietnam in February 1979 which was withdrawn four weeks later after heavy resistance by Vietnamese guerrillas bearing Soviet and American weapons. Nonetheless, head of the CCP Deng Xiaoping supported the Khmer Rouge for another ten years in exile limiting his criticism of the two million-victim genocide assessing "the domestic counterintelligence activities created