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He later was elected as General Secretary , later President , of the League of Communists of Yugoslavia ( 1939 – 1980 ) .
 League of Communists of Yugoslavia
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:
 League of Communists of Yugoslavia