What is the biggest boxing organization?

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Tags

1. #awards
2. #known
3. #professional
4. #organizations
5. #bouts
6. #alongside
7. #formerly
8. #world
9. #which
10. #level
11. #oldest
12. #boxing
13. #sanction
14. #title
15. #major
16. #championship
17. #national
18. #association