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During a visit to London in 1931 , Mahatma Gandhi - who had joined the Vegetarian Society 's executive committee when he lived in London from 1888 to 1891 - gave a speech to the Society arguing that it ought to promote a meat-free diet as a matter of morality , not health .
 London, Mahatma Gandhi, Vegetarian Society, London, Society
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 London, Mahatma Gandhi, Vegetarian Society, London, Society