“In 1942 the Polish resistance fighter Jan Karski gave eye witness testimony to the Supreme Court judge Felix Frankfurter of the clearing of the Warsaw Ghetto and the systematic murder of Polish Jews in the Belzec concentration camp. Listening to him, Frankfurter, himself a Jew, and one of the outstanding legal minds of his generation, replied, “I must be frank. I am unable to believe him.” He added: “I did not say this young man is lying. I said I am unable to believe him. There is a difference.”
