The reproduction of capital requires not only human labor at the site of production, but in the homes and communities workers return to each night to prepare themselves and the next generation of workers to return to work day after day, and year after year. This talk explains the role and breadth of social reproductive labor under capitalism, explores the historic significance of this labor to women's oppression, and ultimately argues that acknowledging this often unpaid, under-valued, and widely ignored form of labor is crucial to uniting the working class and to strengthening the struggle for international socialism.