Some reports indicate that his was killed in Vilna itself, while other reports indicate that he was first taken to Ponar, where he was killed by the Einsatzgruppen.
After the war she became a teacher and also researched the Ponary massacre.
Information about the massacre began to spread as early as 1943, due to the activities and works of Helena Pasierbska, Józef Mackiewicz, Kazimierz Sakowicz and others.
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In 1942, he witnessed the Ponary massacre of some 100,000 mostly Polish Jews by German SD, SS and the Lithuanian Nazi collaborators Ypatingasis būrys, which he described in his 1969 book Nie trzeba głośno mówić (One Is Not Supposed to Speak Aloud).
Margolis found and published the long-lost diary of Kazimierz Sakowicz, a Polish Christian journalist who witnessed the Ponary massacre outside Vilnius, where tens of thousands of Jews were murdered.
The first was to bearing the message, as an eye witness, of the methodical extermination of Jews in Punar, near Vilna; her fellow Jews had not heard these details until then.