More information on Kaethe Jadwiga Kaempfer-Ledermann can be found in the work of Melissa Müller Anne Frank, de biografie (Amsterdam, 1998) [translated from the German]
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The Apeldoorn police commissioner requested that Käthe Jadwiga Kämpfer-Ledermann, residing in Apeldoorn, be located, detained and brought to trial. She was suspected of having changed her place of residence without the required authorization. This description referred to Jews who had gone into hiding.
Algemeen Politieblad, nr 39, 1 October 1942, 1111, notice 2087
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