Many healthy, young strong Jews were not killed immediately. The Germans' war effort and the “Final Solution” required a great deal of manpower, so the Germans reserved large pools of Jews for slave labor. These people, imprisoned in concentration and labor camps, were forced to work in German munitions and other factories, such as I.G. Farben and Krupps, and wherever the Nazis needed laborers. They were worked from dawn until dark without adequate food and shelter. Thousands perished, literally worked to death by the Germans and their collaborators.
Schindler started out as a wartime profiteer, having acquired an enamelware factory in Poland in 1939. At the height of his business, Schindler had 1,750 workers under his employment — 1000 of them Jewish. Over time, his daily interactions with his Jewish workers prompted him to use his political connections as a former German spy and his wealth to bribe Nazi officers to prevent his workers from being deported and killed. Through various Jewish administrators came what was known as "Schindler's List," although in reality, there were nine separate lists and Schindler, at the time, did not oversee the details since he was incarcerated for suspicion of bribery.
In September 1939, the German army occupied the western half of Poland. German police soon forced tens of thousands of Polish Jews from their homes and into ghettoes, giving their confiscated properties to ethnic Germans (non-Jews outside Germany who identified as German), Germans from the Reich or Polish gentiles. Surrounded by high walls and barbed wire, the Jewish ghettoes in Poland functioned like captive city-states, governed by Jewish Councils. In addition to widespread unemployment, poverty and hunger, overpopulation made the ghettoes breeding grounds for disease such as typhus.
Some Germans, even some Nazis, dissented from the murder of the Jews and came to their aid. The most famous was Oskar Schindler, a Nazi businessman, who had set up operations using involuntary labour in German-occupied Poland in order to profit from the war. Eventually, he moved to protect his Jewish workers from deportation to extermination camps. In all occupied countries, there were individuals who came to the rescue of Jews, offering a place to hide, some food, or shelter for days or weeks or even for the duration of the war. Most of the rescuers did not see their actions as heroic but felt bound to the Jews by a common sense of humanity. Israel later recognized rescuers with honorary citizenship and commemoration at Yad Vashem, Israel’s memorial to the Holocaust.
While these massacres were happening, the Nazis elsewhere were laying plans for an overall 'solution to the Jewish question'. Death camp operations began in December 1941 at Semlin in Serbia and Chelmno in Poland, where people were killed by exhaust fumes in specially modified vans, which were then driven to nearby sites where the bodies were plundered and burnt. 250,000 Jews were killed this way at Chelmno and 15,000 at Semlin.
On March 7, 1933, an important law was passed by the newly-elected German Congress, which called for all high-level government officials in the German states to be appointed by the Nazis and for all state government positions to be supervised by the Nazis in the event of an emergency. Germany was already in an emergency situation and Article 48 of the German Constitution had already been invoked. Under this new law, Heinrich Himmler was appointed the acting Chief of Police in Munich, although his real job was Reichsführer-SS, the leader of Hitler's elite private Army.
The major reasons for the state of Belsen were disease, gross overcrowding by central authority, lack of law and order within the huts, and inadequate supplies of food, water and drugs. In trying to assess the causes of the conditions found in Belsen one must be alerted to the tremendous visual display, ripe for purposes of propaganda, that masses of starved corpses presented.
From 1933 until 1938, most of the people held in concentration camps were political prisoners and people the Nazis labeled as "asocial." These included the disabled, the homeless, and the mentally ill. After Kristallnacht in 1938, the persecution of Jews became more organized. This led to the exponential increase in the number of Jews sent to concentration camps.
After 1945 the name was applied to the displaced persons camp established nearby, but it is most commonly associated with the concentration camp. From 1941 to 1945, almost 20,000 Soviet prisoners of war and a further 50,000 inmates died there. Overcrowding, lack of food and poor sanitary conditions caused outbreaks of typhus, tuberculosis, typhoid fever and dysentery, leading to the deaths of more than 35,000 people in the first few months of 1945, shortly before and after the liberation.