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The Huntsville Massacre was an event that occurred during the American Civil War one mile northeast of Huntsville , Arkansas , in which nine men believed to be Confederate sympathizers were shot by Union soldiers .
 Huntsville, Huntsville , Arkansas, Confederate, Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Huntsville, Huntsville , Arkansas, Confederate, Union