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He was a member of the Polish Socialist Party from 1945 to 1948 as well as its successor , the Polish United Workers ' Party .
 organization: Polish Socialist Party; organization: Polish United Workers ' Party
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Polish Socialist Party; organization: Polish United Workers ' Party