This paper examines to what extent union-cooperative partnerships might revitalize labor movements and identifies important factors shaping the nature of union-cooperative partnerships. The premise is that the level of strong or weak class consciousness is an important factor in shaping the nature of union-cooperative relations. Using a case study of Denver’s immigrant taxi union cooperative in the United States and a bus drivers’ union cooperative in South Korea, the paper argues that union-coop partnerships built with strong class-conscious organizing (as in Korea) bring more transformational energy to the labor movement than union-coop partnerships in the “business unionism” model, as in the United States.