Malchiel Gruenwald
Malchiel Gruenwald (Hebrew: מלכיאל גרינוולד; also written Grünwald, Gruenvald, and Greenwald) (1882–1968) was an Israeli hotelier, amateur journalist, and stamp collector, who came to public attention in 1953, when he accused an Israeli government employee, Rudolf Kastner, of having collaborated with the Nazis during the Holocaust.