 The subject is shrouded in controversy according to Szymon Datner, but in Lukas' estimate about half of those who survived within the changing borders of Poland were helped by "Żegota".The number of Jews receiving assistance who did not survive the Holocaust is not known.Perhaps the most famous member of "Żegota" was Irena Sendler, who managed to successfully smuggle 2,500 Jewish children out of the Warsaw Ghetto.