Johanna Dingsdag was a daughter of Salomon Dingsdag.
Stadsarchief Amsterdam, archiefkaart Salomon Dingsdag
Johanna Slagter-Dingsdag was an office clerk. She did underground work for the Dutch communist party (CPN), especially for the resistance paper De Waarheid. In late March 1944 she was caught and deported to Auschwitz.
NIOD, Erelijst Verzet en Koopvaardij, database vervaardigd door dhr J.W. de Leeuw
Johanna Dingsdag was among other things secretary for the 'Vrije Jeugd Vereeniging' (VJV), a communist organisation.
Archief Centrale Inlichtingendienst