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From 1967 to 1973 , many local police departments , college campus staff members , and other independent informants collaborated with the CIA to keep track of student radical groups that opposed the U.S. government 's foreign policies on Vietnam .
 CIA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 CIA