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In 1927 , Nationalist Field Marshal ( Generalissimo ) Chiang Kai-shek purged the Communists from the Front while the Northern Expedition was still half-complete .
 Chiang Kai-shek
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chiang Kai-shek