Pierre Elliott Trudeau – radical progressive or unavowed socialist? His legacy remains divisive. The Constant Liberal traces the charismatic politician’s relationship with the left and labour movements throughout his career. Christo Aivalis argues that Trudeau was in fact a consistently classic liberal, driven by individualist and capitalist principles. This comprehensive analysis showcases the interplay between liberalism and democratic socialism that defined Trudeau’s world view – and shaped his use of power. The Constant Liberal suggests that Trudeau’s leftist activity was less a call for social democracy than a warning to fellow liberals that lack of reform could undermine liberal-capitalist social relations.