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Characters in the film are named for such real-life personages as Don Siegel , Kenji Mizoguchi , Richard Widmark , Robert McNamara , David Goodis , and Richard Nixon .
 Don Siegel, Kenji Mizoguchi, Richard Widmark, Robert McNamara, David Goodis, Richard Nixon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Don Siegel, Kenji Mizoguchi, Richard Widmark, Robert McNamara, David Goodis, Richard Nixon