New research into the political attitudes and behaviours of union activists challenges traditional beliefs about the prospects for politicizing unionists in Canada. A study of union activists in Alberta finds two significant results. First union activists are more politically active than the average Canadian. This contradicts conventional wisdom about union activists. Second, unions can play a direct and important role in fostering political participation among their activists, a finding that has the potential to extend to the general membership. However, to be effective in mobilizing unionists politically, unions need to approach the project differently than they do at present. It is a project of action, not words, and it must be grounded in the lived experience of union workers. In particular, perceptions of class play a central role in shaping the political decisions of unionists. Relational articulations of class lead to political mobilization, and thus union actions must reflect the lived experience of being working class in Canada.