 In this environment Andriesse and her friends came into contact with International Red Aid and various anti-fascist artists' organizations.In June 1941 Andriesse married graphic designer and visual artist Dick Elffers (a gentile with whom she had two sons, one who died young), but as a Jew during the Nazi occupation Andriesse was no longer able to publish and she was forced into hiding.At the end of 1944, with the assistance of the anthropologist she forged an identity card and re-engaged in everyday life, joining a group of photographers, including Cas Oorthuys and Charles Breijer, working clandestinely as "De Ondergedoken Camera".