The answer is, of course, cocaine.
Antwerp, Europe’s diamond capital, is now better known as a key way station on the drug superhighway into the EU from Panama, Ecuador and Paraguay.
Customs officers have seized 110,000 kilograms of cocaine here in the last year alone, and U.N. figures show that organized crime networks are turning over around €130 billion a year from the cocaine trade.
Four-fifths of the drug consignments that arrive in Antwerp are subsequently transported across the border into the Netherlands to be cut, packaged and distributed across the Continent. And Europe’s insatiable appetite for cocaine means drug mafias now have industrial quantities of cash at their disposal — plenty to buy off prying eyes.
https://www.politico.eu/article/belgium-antwerp-drugs-violence-organized-crime/