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Prison gangs Hispanic Black Caucasian Latent prison management function Christian Parenti argues in his book Lockdown America that prison gangs serve a convenient function for the prison establishment and officers .
 Christian Parenti
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Christian Parenti