On numerous occasions, I heard the name 'ang mo' being mentioned. Was told there are several in the betting scene. One of the 'ang mo' is reputed to be an expert in evaluating soccer teams - players available, formation, past trend etc. The other 'ang moh' bets big based on 'connections' and matches deemed to be kelonged. Some friends told me they followed whoever their 'ang mo' was but emerged blue black.
This group of Angmohs' main line was horse racing in HK and Football was secondary.
They won about a few hundred million USD until the HK Jockey Club surrendered and banned them from betting. It was reported on the front page of HK main newspaper.
Horse racing in HK there was no fixing, but football I knew was fixed by them.