Klazina de Leeuw lived in a large house at 5 Rijnkade in Alphen aan den Rijn, where she ran a boarding house. Many Jews from Germany and Poland intending to settle in Alphen aan den Rijn boarded with her first. Klazina de Leeuw was a sister of Aaltje Hijmans-de Leeuw.
Klazina was picked up during the major raid in Alphen aan den Rijn on 30 September 1942 and deported to Auschwitz via Westerbork.
L. de Brouwer, De Joodse Gemeente Alphen aan den Rijn, 1792-1964 (Haarlem 2002) 52-55
In addition, a Jokos file (number 15512) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 7132 / 16066).
This person is commemorated on a memorial in Alphen aan de Rijn. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.