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Background and education The son of Arthur Greenwood ( Deputy Leader of the Labour Party under Clement Attlee ) and his wife Catherine Ainsworth , Greenwood was educated at Merchant Taylors ' School , and then read politics , philosophy and economics at Balliol College , Oxford , where he held the posts of chairman of the Labour Club and , in 1933 , president of the Oxford Union .
 Arthur Greenwood, Labour, Clement Attlee, Greenwood, Merchant Taylors ' School, Balliol College , Oxford, Labour, Oxford Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arthur Greenwood, Labour, Clement Attlee, Greenwood, Merchant Taylors ' School, Balliol College , Oxford, Labour, Oxford Union