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He was the vice-chairman of the Hong Kong Wearing Apparel Industry Employees ' General Union , under the pro-Beijing Hong Kong Federation of Trade Unions .
 Hong Kong, Hong Kong Federation of Trade Unions
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hong Kong, Hong Kong Federation of Trade Unions