Abstract
This article investigates the under-researched topic of women's representation in radical unions, drawing on an in-depth case study of the French Solidaires, Unitaires et Democratiques (SUD) movement. In addition to an overview of the institutional and organizational dynamics of unions' inequality regimes', it offers a contextually grounded analysis of the barriers and enablers of women's participation in SUD unions. More specifically, this research reflects on the complex interrelationships between class and gender in class-based militant trade unions that claim to be feminist but fail to support working-class female workers' participation.