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If Chiang Kai-shek conducted an all-out purge of the CCP in spring 1926, instead of the limited purge of March 1926, where he reduced Communist & KMT rivals power, what would the results have been. As it happened, Chiang's March 1926 limited purge (https://en.wikipedia.org/wiki/Canton_Coup) enabled him to strengthen his own power, while still retaining the support of the Soviet Union and CCP against his warlord enemies.
Soviet support for his government ended only after the April 1927 Shanghai massacre. Despite Soviet support for Chiang during the Sino-Japanese War, note that the Soviets did *not* support him between the Shanghai massacre of 1927 and the creation of the 2nd United Front in 1936.
If Chiang made the "clean break" with the communists a year earlier, in Guangzhou, prior to the northern expedition (https://en.wikipedia.org/wiki/Northern_Expedition) what consequences might have occurred for Chiang and the Chinese Nationalist Party, bad or good?