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After that he was active in the Italian Democratic Socialist Party , in Socialist Autonomy , in Popular Unity and in the Italian Socialist Party , which he represented in the Chamber of Deputies from 1958 to 1968 and in the Senate of the Republic from 1968 to 1972 .
 Italian Democratic Socialist Party, Socialist Autonomy, Popular Unity, Italian Socialist Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Italian Democratic Socialist Party, Socialist Autonomy, Popular Unity, Italian Socialist Party