2422
The case had been closely watched at the start when players claimed that the ` ` single - entity ' ' structure of the league _ a centralized ownership mimicked by every new sports league formed since MLS _ was itself an antitrust violation .
 the league, every new sports league formed since MLS, MLS, players
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 the league, every new sports league formed since MLS, MLS, players