Schwarzbart and Zygielbojm played key roles in highlighting reports of Nazi atrocities against Jews in occupied Poland.[5] In 1942 Schwarzbart held a press conference in London alleging that 1 million Jewish people had already been killed. The figures were reported in the media but were treated sceptically by both the British and by some other Polish politicians.[6][page needed]
^Marek Jan Chodakiewicz, book review of Dariusz Stola, Nadzieja i Zagłada: Ignacy Schwarzbart – zydowski przedstawiciel w Radzie Narodowej RP (1940-1945) (Warszawa: Oficyna Naukowa, 1995), in Intermarium Archived Issue, Volume 5, No. 3 (2002), site of the Columbia University.