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Both ideologies believe that the product of labor does not belong to the capitalist due to it being produced by the worker and not the employer , however , there are slight differences between the opinions taken by anarchist communist Peter Kropotkin and Karl Marx .
 Peter Kropotkin, Karl Marx
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Peter Kropotkin, Karl Marx