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The " Keep South Africa In " group included Britain 's Harold Macmillan , Rhodesia and Nyasaland 's Roy Welensky , Australia 's Robert Menzies and Keith Holyoake of New Zealand .
 Harold Macmillan, Roy Welensky, Robert Menzies, Keith Holyoake, New Zealand
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harold Macmillan, Roy Welensky, Robert Menzies, Keith Holyoake, New Zealand