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The Unnichekkan group opposed the merger of CPI ( ML ) Red Flag with Kanu Sanyal 's Communist Party of India ( Marxist-Leninist ) .
 Unnichekkan, Flag, Kanu Sanyal, Communist Party of India ( Marxist-Leninist )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Unnichekkan, Flag, Kanu Sanyal, Communist Party of India ( Marxist-Leninist )