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Another early theme was the relationship between masses and elites , both outside and within such movements ( Gaetano Mosca , Vilfredo Pareto , Robert Michels , Moisey Ostrogorski ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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