Renowned historian Howard Zinn has chronicled centuries of people's struggles against oppression and economic exploitation in his A People's History of the United States and A People's History of American Empire. This week, Howard Zinn joins Bill Moyers to discuss the voice of today's people in the shadow of big interests' outsized influence in Washington. Zinn is a professor emeritus at Boston University, and co-editor of the new film The People Speak for the History Channel.