It’s business. The million-plus migrants who’ve entered Europe since 2015 haven’t just incited political turmoil. They’ve fueled an industry that’s making smugglers, organized criminals and government contractors rich. A city in Mali is booming from illegal trans-Saharan smuggling that’s multiplied 16 times in two years. In Italy, it’s feeding Mafia coffers with refugee prostitutes and drug dealers. In Turkey, it’s enabling child labor, and in Germany, it enriched a housing contractor who spent as little as $11 a day on asylum-seekers — all part of an abusive infrastructure authorities struggle to control.