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Leon Trotsky believed that those at the top of the chain of command , regardless of their intellectual capacity , operated without the input and participation of the millions of people who participate in the economy and who understand / respond to local conditions and changes in the economy .
 Leon Trotsky
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Leon Trotsky