What does it mean to conceptualize solidarity as an infrastructure? Thinking solidarities as infrastructures implies that they are foundational: a set of tools, strategies, and actions for building alternative futures. Organizing meetings, setting up mutual aid networks, creating and sustaining structures for collective learning, organizing, and political education, and building social and political relationships are all examples of operations of solidarity that might be scaled into infrastructures. Wondering what it would mean to react and respond to catastrophic events with different modes and scales of solidarity, this collection of dispatches aims to think about solidarity as an infrastructural tool, strategy, and action equipped to imagine and bring about change.