To solve the new century's mounting social and environmental problems, people of color activist and white activists need to be able to join forces. But all too often, the unconscious racism of white activists stands in the way of any effective, worthwhile collaboration. The Challenging White Supremacy Workshop is the most powerful tool that I have seen for removing the barriers to true partnerships between people of color and white folks. If the CWS trainings were mandatory for all white activists, the progressive movement in the United States would be unstoppable.