To explain this puzzle, the book develops a theory utilizing the literature on social identity. It argues and empirically finds that political and economic conditions relatively unfavourable to the working class increase blue-collar worker support for the populist radical right in Western Europe by strengthening these workers' national identity and thus also the salience they place on cultural issues. Castater and Han's analysis suggests that if governing parties desire to reduce support for the populist radical right, they should incorporate labour organizations into the welfare state reform process, enact economic policies that improve the well-being of a broad swath of the working class, and reduce the types of economic inequality that most affect blue-collar workers.