Bridgespan's experience and relationships working with institutional foundations and philanthropists created an opportunity to dive into the common challenges we've heard funders navigate: What role could philanthropy play in movement building in criminal justice reform? How might mindset and practice need to shift to enable effective giving to movement?The purpose of this report is to provide guidance for some of those common challenges by offering the perspectives and wisdom of those doing the work. Our research included interviews with more than 40 movement leaders, funders, and others across the ecosystem seeking transformative change of our criminal legal system, as well as a review of literature to understand how social movements can achieve equitable change.Bridgespan recognizes that this research is indebted to the work of many others who have long been thinking about these issues deeply. We hope to contribute to that ongoing conversation and the fight for equity and justice.