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A Dutch policeman, one of the major betrayers of Jews in hiding during the war, he was one of those who raided the annexe. He was friends with, or acquainted with, Tonny Ahlers. He was executed on 30 Aug 1948, for betraying many, many Jews. (HLOF p. 125, 128, 220, 319, 367 [note #29]; note that he lived at the same address as Tonny Ahlers but not at the same time: Kuiper lived there very soon after Ahlers did)
