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He played three years in the St. Catharines Black Hawks system , but left the team midway through the 1974 – 75 Ontario Major Junior Hockey League season following a dispute with coach Hap Emms , joining the tier II Niagara Falls Flyers .
 St. Catharines Black Hawks, Ontario, Hockey, Hap Emms, Niagara Falls Flyers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 St. Catharines Black Hawks, Ontario, Hockey, Hap Emms, Niagara Falls Flyers