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According to Karl Marx , representation of the interests of different classes is proportional to the influence which a particular class can purchase ( through bribes , transmission of propaganda through mass media , economic blackmail , donations for political parties and their campaigns and so on ) .
 Karl Marx
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:
 Karl Marx