Johanna Dingsdag was the eldest of the nine children of Salomon Dingsdag and Saartje Bos. On 1 May 1927, Labour Day, she became engaged to Joseph Slagter, 'Jos'; they married in 1928. They had four children: Else, Hans, Willy and Gerda. Johanna was an office clerk, a member of the communist party CPN, and did resistance work for the underground paper De Waarheid. At the end of March 1944 she was arrested and deported to Auschwitz. She lived to see the liberation of the camp on 27 January 1945, but died of exhaustion a month later, on 28 February 1945. She was 36. Jos and the four children survived the war; the children were in hiding.
