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In what became known within the movement as the " Great Conway Hall Plot " , a group of nine RPA " modernisers " , including Joad , Robertson , Coates and John A. Hobson , stood for the RPA Board on a " scientific humanism " platform .
 RPA, Joad, Robertson, John A. Hobson, RPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 RPA, Joad, Robertson, John A. Hobson, RPA