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Roger Ebert approved of the use of the label in unsuccessful films that had been tampered with by studio executives , such as Sergio Leone 's original cut of " Once Upon a Time in America " , and the moderately successful theatrical version of " Daredevil " , which were altered by studio interference for their theatrical release .
 Roger Ebert, Sergio Leone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roger Ebert, Sergio Leone