 Finkelstein has written of his Jewish parents ' experiences during World War II . His mother , <unk> <unk> , grew up in Warsaw , survived the Warsaw <unk> , the <unk> concentration camp , and two slave labor camps . Her first husband died in the war . She considered the day of her liberation as the most horrible day of her life , as she realized that she was alone , her parents and siblings gone . Norman 's father , <unk> Finkelstein , active in <unk> <unk> , was a survivor of both the Warsaw <unk> and the Auschwitz concentration camp . 
