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He improved to 23 goals in 1979 – 80 , but after failing to score in his first 18 games the following season , he was dealt to the Chicago Blackhawks on December 18 , 1980 , in a trade for defenceman Mike O'Connell .
 Chicago Blackhawks, Mike O'Connell
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:
 Chicago Blackhawks, Mike O'Connell