
1) Arbiters 2) Boston Garden whistlers 3) Court officials 4) Court whistle-blowers 5) Football officials 6) Instant replay viewers 7) Officials to ensure fair play 8) Ring leaders 9) Separates boxers 10) Sports officials 11) Umpires 12) Whistle blowers
Found on
https://www.crosswordclues.com/clue/referees
[Ice Hockey] the chief officials in a hockey game, distinguished from the other officials by a red armband; they start the game, call most of the penalties and make the final decision in any dispute; they are responsible for making sure the ice, the nets and the clock are in good condition; they wear black pants and an offic...
Found on
http://www.firstbasesports.com/hockey_glossary.html

officials who call violations and fouls, give penalties, signal field goals, and stop and start play
Found on
https://www.englishclub.com/vocabulary/sports-basketball.htm
No exact match found.