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Stalin had prepared for the congress by replacing many local party delegates with those loyal to him , mostly at the expense of Zinoviev and Kamenev 's backers .
 Stalin, Zinoviev, Kamenev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stalin, Zinoviev, Kamenev