Thirty years after celebrating the fall of the Berlin Wall, Europe has gone on a wall-building spree. In its next budget cycle (2021-27), the EU plans to spend €34.9bn ($38.4bn) on border security, to help manage the tens of thousands of migrants trying to enter the region every year. As a result, business is booming for Europe’s border security industry. A 2019 report by the Transnational Institute has revealed that a small cohort of European arms companies profit handsomely from the huge growth in the EU’s border budgets. These large companies are increasingly influential in shaping EU policy and encouraging...