Revealing the central role of Black activists in spurring interracial solidarity in the US labor movement. Most accounts of interracial solidarity focus on white union activists. In Freedom Train, Cedric de Leon, a former organizer and elected leader in the US labor movement, argues that we can't comprehend the history of workers' triumphs in the United States without investigating the role of Black liberation. This book shows that, from the early twentieth century to the years immediately following the March on Washington and beyond, independent Black labor organizations have pushed the white labor movement toward a fierce and effective interracial solidarity. Drawing on the minutes, correspondence, and speeches of Black labor activists and organizations from 1917 to 1968, de Leon reveals that Black people have been the most ardent and consistent proponents of racial inclusion, leadership representation, and programs linking economic and racial justice. He also demonstrates how conflict and consensus among Black labor groups fueled the fight for solidarity, as different factions split and consolidated to form successive and sometimes competing Black labor organizations. Freedom Train centers the contributions of Black people to the multiracial unions we have today and demonstrates that internal conflict can be a source of strategic innovation and social movement success.