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The end result of his efforts was the formation a much more " ethical " league , which was named the National League of Professional Base Ball Clubs .
 National League of Professional Base Ball Clubs
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:
 National League of Professional Base Ball Clubs