George Soros has been the go-to bogeyman for the American right — and right-wing leaders around the world — for years. The 95-year-old billionaire has funneled money into causes around the globe, supporting democratic endeavors, immigration efforts and criminal justice reform through his Open Society Foundations, which he founded in 1979. In the intervening decades, Soros, with his large network of progressive causes and opposition to strong-arm governments, has become the target of conspiracy theories in areas that range from Malaysia to his birth country of Hungary, where a so-called “Stop Soros” law made it illegal to aid undocumented immigrants...