The number of new arrivals in the concentration camps rose so dramatically over the years that they could no longer be registered solely by the responsible Gestapo officers. For this reason, more and more prisoners (known as prisoner functionaries) were used for this work. These prisoner functionaries had to write their names on other forms if they were responsible for registration. On this particular form, the prisoner clerk only wrote his prisoner number: 4643. This was the number of Otto/Otakar Trčka, a political prisoner from Budweis (today in the Czech Republic). He was born in 1883, became the director of a secondary school, and was sent to Buchenwald in 1939, where he remained until the camp was liberated in April 1945. Trčka was one of several camp interpreters in Buchenwald.