EU faces threat to migration principle

"Free movement is a bit like the euro," warns Hugo Brady, a fellow at the Centre for European Reform, a think tank, recalling the single currency's recent troubles. "It's a thing the EU created and then forgot about, thinking it would never be problematic thereafter. … Free movement is such an accepted part of Europe today that Brussels policymakers don't even think of people relocating from one EU country to another as migration ... But to the man in the street, what the EU calls 'free movement' is in fact intercontinental migration."