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The awards were established in 1949 in memory of George Polk , a CBS correspondent who was murdered in 1948 while covering the Greek Civil War ( 1946 – 49 ) .
 George Polk, CBS, Greek Civil War
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:
 George Polk, CBS, Greek Civil War