One in three of all Jews killed at Auschwitz were Hungarian citizens .
All but 15,000 of these Jews were sent to Auschwitz - Birkenau , and 90 % of those were immediately killed .
One in three of all Jews killed at Auschwitz - Birkenau were Hungarian citizens .
All but 15,000 of these Jews were sent to Auschwitz - Birkenau , and 90 % of those were immediately killed .