EU Setting Up 666 Enforcer

The European Union is in the process of establishing the European Public Prosecutor’s Office.This is a major, first-of-its-kind move, with the EU setting up a European-wide prosecutor’s office that will have power to investigate and charge people for financial crimes committed against the EU. It looks like this type of office may end up persecuting those that do not have the mark of the Beast when they "buy or sell" as that will later be considered a financial crime in Europe. What does 666 mean?