This article describes teachers' collective work aimed at learning to teach mathematics for social justice. Teacher interviews, discussions, lessons, and written reflections were analyzed using grounded theory methodology, and teachers' conversations were examined concerning the relationship between mathematical goals and social justice goals. Analysis revealed that early tensions arose around balancing these goals, that teachers focused more attention on the social justice component, and that the instantiation of these goals in practice proved difficult. (Contains 2 tables and 3 footnotes.)