60 Minutes interviews the priest who’s made it his mission to expose the forgotten victims of the Holocaust

The Holocaust is marked and memorialized at places like Auschwitz, Bergen Belsen, Dachau. But nearly half of the six million Jewish victims were executed in fields and forests and ravines, places that were not named and remain mostly unmarked today. They were slaughtered in mass shootings and buried in mass graves in the former Soviet Union, where until very recently, little had been done to find them.

Our story is about a man who's brought these crimes of the Holocaust to light. He is not a historian, or a detective or a Jew. He's a French Catholic priest named Father Patrick Desbois. And for the past 13 years, he has been tracking down the sites where many of the victims lie and searching for witnesses who are still alive; many of whom had never been asked before to describe the horrors they had seen more than 70 years ago.