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In contrast with the " big-A anarchism " of the classical era , the newly coined term " small-a anarchism " signals their tendency not to base their thoughts and actions on classical-era anarchism or to refer to classical anarchists such as Peter Kropotkin and Pierre-Joseph Proudhon to justify their opinions .
 Peter Kropotkin, Pierre-Joseph Proudhon
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, Pierre-Joseph Proudhon