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He then entered the film industry in 1931 when he became a scenarist for the Marx Brothers ' movie Monkey Business where he befriended Groucho Marx .
 Marx, Groucho Marx
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marx, Groucho Marx