David Strathairn plays historic Holocaust witness Jan Karski in PBS's 'Remember This'

(JTA) — As a Roman Catholic in Warsaw during World War II, Jan Karski could easily have ignored the horrors unfolding behind the walls of the Jewish ghetto. Instead, as a member of the Polish Resistance, he donned a yellow Star of David and infiltrated the Warsaw Ghetto to report on what was happening to the Jews there.

Karski’s reconnaissance in the ghetto and elsewhere provided the West with some of the first eyewitness accounts of the Holocaust. He even met with U.S. President Franklin D. Roosevelt in 1943 to share what he saw — though the information he provided did not cause Roosevelt to...