The NYT has a pretty decent article on the brains behind the multi-million dollar gambling syndicate that has spread its tentacles over every interface in the sport, in every league, involving players, officials, administrators, and created suspicion about every result. Did Barca really have an off day at Milan? Mmmmmm.
One suspects that this is not the only gambling syndicate in the business of match fixing, although it might certainly be the biggest one in Asia and Europe. Most of these cartels have strong local offshoots or collaborators and in Dan Tan's case, it was the Eastern men, who handled Europe.