A feature about Jan Karski, the World War II Polish resistance fighter who risked his life to blow the whistle on the Holocaust. Karski in 1942, defying great danger, twice infiltrated Warsaw’s Jewish Ghetto to witness its horrors and managed to give first-hand accounts of the Holocaust from the Warsaw Ghetto to the Allies, including U.S. President Franklin D. Roosevelt in 1943. But his alarm cries fell on deaf ears.