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the idea is never that the CCP cheated the victory by using the spies. it is all about showing respect to the truth of history and debunking the lies of the past. the spies played an ultimately decisive role in the CCP’s military victory, and that was the truth of the Chinese civil war then. whether or not the spies’ contributions made the CCP’s victory much less glorious or enjoyable, that depends on interpretations.
Spies are just one piece in the jigsaw puzzle, albeit an important one. Without good generals, tactics, troop morale, logistics and planning, etc, the information provided by the spies cannot be put to good use.
I look at this period of Chinese history in the the same way I look at the French revolution, Three Kingdoms, Renaissance Italy, etc.
Even in the choice of spy chief, the Peanut (US intelligence service code word for Chiang Kai Shek) proves the saying "birds of the same feather flock together":
Dai Chunfeng soon became a skilled gambler who could often be found in one of Shanghai's many casinos, trying to win enough money to make ends meet. It was in a Shanghai casino that he met Du Yuesheng, head of the criminal Green Gang. Through Du Yuesheng he later met Chiang Kai-shek. It is unclear when Chiang and Dai first met, but it was likely around 1921. He later lost all of his money and was forced to return home to Bao'an. In 1927, Dai met his elementary school friend Mao Renfeng who suggested that he enroll in the Whampoa Military Academy in Guangzhou, where Chiang was then Superintendent-Commandant. Dai took the suggestion, obtained a letter of recommendation from Du Yuesheng and set off for Guangzhou.
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The benign title of The Investigation and Statistics Bureau belied the true nature of its secret police work, making Dai one of the most powerful men in China, and earning him the nickname "the Himmler of China". Dai was also the head of the Blue Shirts Society, a fascist organization that did security and intelligence work for Chiang. In 1930s and 1940s, his agents from Military-Statistics Bureau were very successful at penetrating the Chinese Communist Party and Imperial Japanese puppet organizations.
Dai worked with the United States during World War II and was taught new methods of espionage, and his guerrilla force grew to 70,000 men. In return for this partnership, he made available maps of the South China coast, intelligence on Japanese maneuvers and a safe haven for downed Allied aircrew. After the signing of the SACO Treaty in 1942, Dai was placed as head of Sino-American intelligence activities.
Dai died in a plane crash on March 17, 1946, possibly arranged by his counterpart and rival in the Communist Party of China (CPC), the notorious CPC security and intelligence chief Kang Sheng, although there are rumours it was arranged by the American Office of Strategic Services,[1] because it happened aboard an American plane."
While he avoided public entertainments and remained a mysterious figure to his countrymen, Dai was privately known for his wild drinking parties.
http://en.wikipedia.org/wiki/Dai_Li