Individuals in decision making position can be biased, and by so may effect the outcome of a game, that I'm sure of. It's unprofessional.
But a larger group of organized individuals deliberately trying to steer results in a preferred direction seems unlikely. I mean, that would have to involve so many person, over such a long period, and I find it impossible to believe it wouldn't have been exposed, or that some whistle blower brought this to medial attention. Why wouldn't that happen? Out of fear? Fear of what, or whom?
Who would be the person in charge of this systematized corruption? And what would be the gain? The obvious (and likely) only answer would be money, right? Someone makes money on it.
So who?