South African Airport Crime Syndicates

My friend sent me this news story about the so-called 'airport syndicate' operating in Johannesburg. The deal is that visitors to the city are trailed from the airport and attacked usually at the entrance to their hotel or place of residence. The immigration and customs staff at the aiport are believed to work hand-in-hand with the robbers, who later way-lay the unsuspecting victims.

These robbers target certain nationalities - Nigerians included - who they know will be carrying huge sums of money on them.

So if the authorities know so much about this crime syndicate, why are these robberies still happening?