On 19 December 1938 over 200 male German refugees over 18 were transferred from Amsterdam to the prison camp Norg in Veenhuizen. On 3 January 1939 207 of them were transferred to the naval base at Hellevoetsluis. Helmut Friedländer was among them.
A.L. Jonker, Joodse vluchtelingen in Hellevoetsluis 1938-1940 (Hellevoetsluis 1995) 107
Biography