Terror threat

Holocaust investigator on parallel between Nazis and ISIS

Like the Nazis, ISIS fighters feel justified in killing those who are different, Desbois explains, and they're eager to spread the word. Desbois discovered that whole villages watched the mass shootings of Jews in Eastern Europe. The killings were a spectacle, not unlike a beheading ISIS might post online. In a world united by the internet, he says, we are all witnesses to their hate.

"It's not the same ideology," Desbois says. "But behind, it's the same disease."

For Goldberg, whose mother was a Holocaust survivor rescued by the Kindertransport, reporting on Desbois' work and the killing sites in Eastern Europe held personal meaning. "It could've been her," Goldberg says. "I wouldn't be here sitting here now talking to you."