Members of the Boys were slave labourers in the Bromberg-Ost labour camp, a subcamp of the Stuthoff concentration camp.
Stutthof concentration camp was operated by Nazi Germany. The camp had 105 subcamps.
The Boys were teenage and child-Holocaust survivors, who were brought to the UK after the war for rest and rehabilitation.

KZ Stutthof Memorial.
The Bromberg-Ost camp was located in the Polish city of Bydgoszcz.
History
Jewish women prisoners were put to work for German railways, Deutsche Reichsbahn, laying railway track and carrying our repairs. They also dug trenches and moved snow.
The women came from Riga, the Kovno Ghetto and Auschwitz II-Birkenau among the later was Lili Moscowitz.
Dissolution
The camp was evacuated in January 1945. The survivors were taken on a death march to Sachsenhausen-Oranienberg.
Aftermath
The guards at the camp were notoriously violent. The commandant of the camp was SS-Scharführe Anton Kniffke. After the war several of the guards were convicted and executed.