Unions must mobilize to defeat racism because it destroys solidarity and brutalizes union members, the demographics of working people are changing rapidly and morality demands action. But mobilizing all of labor to join the fight against racism will not be easy: Race fractures the labor movement itself. AFL-CIO President Richard Trumka said of Ferguson, Mo., “our brother killed our sister’s son,” and, in doing so, he spoke to the tragic facts and also to the internecine racial fault lines that shatter worker solidarity.