A mob controlled major bettor might try to buy off a ref - I mean, it has certainly happened… hell they’ve bought whole teams before … but in today’s world there is one thing legitimate organized gambling would NEVER do- risk a scandal that could blow the whole thing up. There is less than zero chance that they would interfere in any way. There is beyond no need- they are making more money than ever, and a scandal - just one- could ruin the whole thing.
Further, the mob has no control over gambling any more because it’s legal, and they no longer own Ceasar’s and MGM and Bally’s. This isn’t 1975 any more. They are all run by huge corporations with armies of CPAs and nerds.
No one even needs a bookie these days. You can line shop and wager right from your phone 24/7/365.
Doesn’t mean some dude isn’t going to be tempted to lay down five hundred grand on OU and then pay a ref twenty grand to make sure it cashes, but that’s been going on since 1903.
Only problem is now with all the replay and massive scrutiny from the Nevada gaming commission and the SEC and etc, it’s highly, highly unlikely to go undetected.