The spy network that took on America's Nazi groups

In ‘The Secret War Against Hate,’ historian Steven J. Ross details the racist, anti-Semitic groups that sprung up after WWII, in the later half of the 20th century — and the spy network that worked to bring them to justice. He spoke with Terry Gross about that, and how it connects to the Dept. of Justice’s recent indictment of the Southern Poverty Law Center.