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Richard Dixon , born Clifton Reginald Walker ( 26 May 1905 – 7 March 1976 ) was an Australian trade unionist who served as national president of the Communist Party of Australia from 1948 to 1972 .
 person: Dixon; organization: Communist Party of Australia
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: Dixon, Communist Party of Australia 
Answer:
 person: Dixon; organization: Communist Party of Australia