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In the United States , the " war on gangs " is a national movement to reduce gang-related activity , gang violence , and gang drug involvement on the local , state , and federal level .
 United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United States