 Complete the following phrase:  The operation was revived later in the year; the aim was changed from forging money to ficing German intelligence operations. Instead of a specialist unit within the SD, prisoners from Nazi concentration camps were selected and sent to Sachsenhausen concentration camp to work under SS Major Bernhard Krüger. The unit produced British notes until mid-1945; estimates vary of the number and value of notes printed, from 132.6 million up to 300 million. By the time the unit ceased production, they had perfected the artwork for US dollars, although the paper and serial numbers were still being analysed. The counterfeit money was laundered in exchange for money and other assets. Counterfeit notes from the operation were used to pay the Turkish agent Elyesa Baznacode named Cicerofor his work in obtaining British secrets from the British ambassador in Ankara, and 100,000 from Operation Bernhard was used to obtain information that helped to free the Italian leader Benito Mussolini in the 