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In occupied eastern Poland , the NKVD was given the responsibility of evacuating and liquidating over 140,000 prisoners ( NKVD evacuation order No. 00803 ) .
 Poland, NKVD, NKVD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Poland, NKVD, NKVD