In May of 1886 Americans awoke to the news that a bomb had exploded a Chicago labor rally killing several policemen. Coming in the midst of the largest national strike Americans had ever seen, the bombing, the mass hysteria it created, and the sensational trial and executions that followed, made headlines across the country. National sentiment turned against the burgeoning labor movement, ending a moment of hope for the nation's working class.James Green, professor of history at UMASS Boston and Howard Zinn, author of A People's History of the United States discuss the exhilarating rise of a visionary union movement and its downfall in the wake of the Haymarket tragedy.