On this week's "America Changed Forever," we look at the scourge of Domestic Terrorism in America. Chief Justice and Homeland Security Correspondent Jeff Pegues speaks with former head of Homeland Security Michael Chertoff in an exclusive interview. We also hear from Mary McCord, former acting Assistant Attorney General for the Department of Justice. Plus, Pulitzer Prize winner Eric Foner explains how the Ku Klux Klan Act of 1871 is being used to protect us from domestic terrorists.