Ka-tzetnik 135633

Ka-Tsetnik 135633 was the pen name of Yehiel De-Nur, Dinoor or Dinur (born Yehiel Feiner; 16 May 1909 – died 17 July 2001), a Jewish writer and Holocaust survivor, whose books were inspired by his time as a prisoner in the Auschwitz concentration camp. https://en.wikipedia.org/wiki/Yehiel_De-Nur