The Police Commissioner of Leiden requested that Machiel Vreeland, his wife Sientje Kops and their daughters Sara and Anna be located, detained and brought to trial. They were suspected of having changed their place of residence without the required authorization. This description referred to Jews who had gone into hiding.
Algemeen Politieblad, nr 49, 10 December 1942, 1391, notice 3083
In addition, a Jokos file (number 7279) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.