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Its demands for greater Tatar autonomy within the USSR came into conflict with the advocates of a federal system grouped around Joseph Stalin .
 person: Joseph Stalin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Joseph Stalin 
Answer:
 person: Joseph Stalin