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A committed pacifist , Matthews became a self-described " fellow traveler " of the Communist Party , USA through the middle-1930s , achieving national prominence as a leader of a number of the party 's so-called " mass organization s. " A disillusionment with communism followed towards the end of the 1930s .
 person: Matthews; organization: Communist Party , USA
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: Matthews, Communist Party , USA 
Answer:
 person: Matthews; organization: Communist Party , USA