>> i did admire many things that hitler wrote. >> he was a one-time physics professor who became a leading figure in the white supremacist movement. >> villainous, traitorous! >> in the 1960s, pierce saw his cause in disarray. >> i for one will die before i yield one inch. >> for years, the all-powerful ku klux klan had led the charge. >> threats, beatings, rapings and, of course, murder. ♪ we shall overcome >> then came the civil rights movement. a crushing blow to the klan. >> free at last. free at last. thank god almighty, we are free at last! >> in its wake, klan membership declined. and white supremacists were