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G. K. Chesterton 's " The Man Who Was Thursday " ( 1908 ) is a metaphysical thriller ostensibly based on the infiltration of an anarchist organisation by detectives , but the story is actually a vehicle for exploring society 's power structures and the nature of suffering .
 G. K. Chesterton, The Man Who Was Thursday
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 G. K. Chesterton, The Man Who Was Thursday