Abstract

Existing research on developing countries emphasizes the decisive power of teacher unions in education politics. Yet that power varies, and a full understanding of the roots of union power and the sources of cross-national variation requires deeper analysis of organizational dynamics within unions. This analysis supports four arguments. First, teachers have a range of advantages in overcoming obstacles to collective action. Second, unions are not all alike; they vary widely, from interest groups to powerful political machines. Third, the source of this variation lies in factors that shift power within unions from members to leaders in political-machine unions. Fourth, analyzing the dimensions of variation helps explain the different outcomes of recent reforms to teacher careers in Latin America, especially in highlighting the staunch opposition from political-machine unions.