Less than an hour from the capital of the European Union, gangs fight gun battles in the streets or bomb each other’s outposts. Crime reporters, police and prosecutors are bought off or killed. Torture cells are set up in shipping containers and bodies can be cleanly disposed of, but when the gangs really want to send a message they set up a public execution or fire off a rocket. That’s the way things are done, not in Bogota or Beirut, but in Antwerp. Europe’s initial Islamic migration followed port cities. Among those leading port cities were Rotterdam and Antwerp which...