In the months following Germany's invasion of the Soviet Union, Jews, political leaders, Communists, and many Roma (Gypsies) were killed in mass shootings. Most of those killed were Jews. These murders were carried out at improvised sites throughout the Soviet Union by members of mobile killing squads (Einsatzgruppen) who followed in the wake of the invading German army. The most famous of these sites was Babi Yar, near Kiev, where an estimated 33,000 persons, mostly Jews, were murdered over two days. German terror extended to institutionalized handicapped and psychiatric patients in the Soviet Union; it also resulted in the death of more than three million Soviet prisoners of war.
World War II brought major changes to the concentration camp system. Large numbers of new prisoners, deported from all German-occupied countries, now flooded the camps. Often entire groups were committed to the camps, such as members of underground resistance organizations who were rounded up during a sweep across Europe under the 1941 Night and Fog decree. To accommodate the massive increase in the number of prisoners, hundred of new camps were established in occupied territories of eastern and western Europe.
During the war, ghettos, transit camps, and forced labor camps, in addition to the concentration camps, were created by the Germans and their collaborators to imprison Jews, Roma (Gypsies), and other victims of racial and ethnic hatred as well as political opponents and resistance fighters. Following the invasion of Poland, three million Jews were forced into approximately 400 newly established ghettos where they were segregated from the rest of the population. Large numbers of Jews were also deported from other cities and countries, including Germany, to ghettos and camps in Poland and German-occupied territories further east.
In Polish cities under Nazi occupation like Warsaw and Lodz, Jews were confined in sealed ghettos where starvation, overcrowding, exposure to cold, and contagious diseases killed tens of thousands of people. In Warsaw and elsewhere, ghettoized Jews made every effort, often at great risk, to maintain their cultural, communal, and religious lives. The ghettos also provided forced labor pool for the Germans. Many forced laborers (who worked in road gangs, in construction, or at other hard labor related to the German war effort) died from exhaustion or maltreatment.
Between 1942 and 1944, the Germans moved to eliminate the ghettos in occupied Poland and elsewhere, deporting ghettos residents to "extermination camps"--killing centers equipped with gassing facilities--located in Poland. After the meeting of senior German government officials in late January 1942 at a villa in the Berlin suburb of Wannsee, informing senior government officials of the decision to implement "the final solution of the Jewish question," Jews from western Europe also were sent to killing centers in the East.
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