350652
Rule 21 of the Gaelic Athletic Association ( GAA ) banned members of the British security forces and the former Royal Ulster Constabulary from participating in Gaelic games .
 Gaelic Athletic Association, Gaelic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gaelic Athletic Association, Gaelic