The prisoners realised that if they managed to fully counterfeit the dollars, their lives would no longer be safeguarded by the work they were undertaking, so they slowed their progress as much as they could. The journalist Lawrence Malkin, who wrote a history of Operation Bernhard, writes that prisoners considered this to have the tacit approval of Krüger, who would face front-line duty if Operation Bernhard ended. In August 1944 Salomon Smolianoff, a convicted forger, was added to the production team at Sachsenhausen to aid the counterfeiting of US dollars, although he also assisted in quality control for the pound notes. The Jewish prisoners working on the operation at the time complained to Krüger at having to work with a criminal, so he was given his own room to sleep in.