After their arrest, helpers Johannes Kleiman and Victor Kugler were held prisoner in Amsterdam from 4 August to 11 September. They stayed in adjacent cells. Then, they were taken to the Amersfoort prison camp. This was a SS prison camp for political prisoners and other criminal cases.
Johannes Kleiman had been convicted of Arbeitsverweigerung (refusal to work). He did not stay at the prison camp long. He had been unwell for a long time, after suffering gastric haemorrhaging. Therefore, he could not be sent to Germany to do forced labour and, at the insistence of the Red Cross, was released seven days later.
Victor Kugler had been convicted of Judenbegünstigung (helping Jews). He was held captive for a longer period. After spending almost three weeks at the camp, he had to do forced labour in various places across the Netherlands. In March 1945, he was marching to Germany in a group of around 600 prisoners. Near the German border, they were fired at by allied planes, which gave him a chance to escape. A few days later, he was back home in Hilversum, where he hid until the German capitulation on 5 May.