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The Hollywood blacklist — as the broader entertainment industry blacklist is generally known — was the mid-20th-century list of screenwriters , actors , directors , musicians , and other U.S. entertainment professionals who were denied employment in the field because of their political beliefs or associations , real or suspected .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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