All of the musicians were required to perform forced labour in addition to their daily concerts. They were also subject to regular selections. As was the case in other camps, the musicians were required to play marches at the main gate when the work commandos left the camp in the morning and returned in the evening. Due to the forced labour, frequent selections, suicides and generally poor health of the musicians, by the end of the year the orchestra was shrinking rather than growing. Simultaneously, the sub-camp commander Johann Schwarzhuber, who provided the men with instruments and sheet music, increased his demands, seriously challenging Kopka's abilities. The latter became increasingly dependent on the arranging and conducting skills of Laks, who grew skilled at composing music with interchangeable parts in case of the sudden disappearance of a musician. Eventually Laks became the de facto conductor, a position made official when Kopka was sent to the front with the German army.
Auschwitz inmates began working at the plant, known as Buna Werke and IG Auschwitz, in April 1941, and demolishing houses in Monowitz to make way for it. By May, because of a shortage of trucks, several hundred of them were rising at 3 am to walk there twice a day from Auschwitz I. Anticipating that a long line of exhausted inmates walking through the town of Oświęcim might harm German-Polish relations, the inmates were told to shave daily, make sure they were clean, and sing as they walked. From late July they were taken there by train on freight wagons. Because of the difficulty of moving them, including during the winter, IG Farben decided to build a camp at the plant. The first inmates moved there on 30 October 1942. Known as KL Auschwitz III-Aussenlager (Auschwitz III-subcamps), and later as Monowitz concentration camp, it was the first concentration camp to be financed and built by private industry.
Repeat selections took place several times during the day in roll calls. Inmates who had become weak or ill were separated from the ranks and sent to the gas chambers. A brutal regimen based on a set of punishments and torture was invoked in the camp. Few managed to survive. In Auschwitz-Birkenau, more than 1,100,000 Jews, 70,000 Poles, 25,000 Sinti and Roma (Gypsies) and some 15,000 prisoners of war from the USSR and other countries were murdered.
Schindler grew up in Svitavy, Moravia, and worked in several trades until he joined the Abwehr, the military intelligence service of Nazi Germany, in 1936. He joined the Nazi Party in 1939. Prior to the German occupation of Czechoslovakia in 1938, he collected information on railways and troop movements for the German government. He was arrested for espionage by the Czechoslovak government but was released under the terms of the Munich Agreement in 1938. Schindler continued to collect information for the Nazis, working in Poland in 1939 before the invasion of Poland at the start of World War II. In 1939, Schindler acquired an enamelware factory in Kraków, Poland, which employed at the factory's peak in 1944 about 1,750 workers, of whom 1,000 were Jews. His Abwehr connections helped Schindler protect his Jewish workers from deportation and death in the Nazi concentration camps. As time went on, Schindler had to give Nazi officials ever larger bribes and gifts of luxury items obtainable only on the black market to keep his workers safe.