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Antisemitism was commonly used as an instrument for settling personal conflicts in the Soviet Union , starting with the conflict between Joseph Stalin and Leon Trotsky and continuing through numerous conspiracy-theories spread by official propaganda .
 Soviet Union, Joseph Stalin, 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:
 Soviet Union, Joseph Stalin, Leon Trotsky