This article argues that mentoring reflects a form of hidden labor within pre-service teacher education. Using Marx's concern for the ways in which aspects of an economic system are rendered invisible, the article draws on discussions from an American mentor teacher advisory council to illuminate otherwise marginalized aspects of mentors' work. Meeting data reveal challenging dynamics of initiative, complications in determining teaching opportunities, and unique positions taken up by mentors during transitions in authority. The authors argue for the creation of "intersection contexts" where the voices of various constituencies in the mentoring of pre-service teachers can be heard. (Contains 1 table.)