This article explores organisational infrastructure in the movement for safe schools during the COVID-19 pandemic. Drawing on several qualitative studies of educator organising during the pandemic, this article shows that educators across the United States have organised through a range of social movement organisations, including national grassroots networks, regional grassroots networks, unions, social justice caucuses, and building-based committees. Through these organisations, they have advanced demands for more equitable public health and education policies, including safety mitigations and wraparound services for students. Building on the literature on social justice unionism, contentious co-governance, and social movement organisations, this article finds that the diverse array of organisational structures and strategies within the movement enabled educators to advance their demands and build power.