They have returned from Frankfurt where they observed something of the Frankfurt Auschwitz Trials.
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The drawings show details and sequences of what he saw in the concentration camps and which he already made as a teenager shortly after the liberation as well as his testimony served as evidence in trials against Nazi criminals (including the Eichmann trial in Jerusalem and the Frankfurt Auschwitz Trials) and were also used in the litigation against Holocaust denier David Irving, who challenges the existence of gas chambers in Auschwitz.