Populism, on both the right and the left, has spread like wildfire throughout Europe and the United States and is making inroads in other parts of the world. In simplest terms, populism is a political ideology that vilifies elites, minorities and foreigners while lionizing "the people." It reached its apogee in the U.S. with the election of Donald Trump but has been a force in Europe since the Great Recession and the refugee crisis. We now see the...