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TDU began in 1975 when a small group of freight Teamsters , some from the International Socialists group in Berkeley , CA met in Chicago , Illinois and founded Teamsters for a Decent Contract ( TDC ) .
 Teamsters, International Socialists, Berkeley , CA, Chicago , Illinois, Teamsters
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Teamsters, International Socialists, Berkeley , CA, Chicago , Illinois, Teamsters