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How did mobile killing units differ from the extermination camps created by the Nazis?

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Auschwitz: entrance gates — Auschwitz The entrance gates to the Auschwitz concentration camp, near Kraków, Poland; the sign reads “Arbeit Macht Frei” (“Work Liberates”).

The Nazi regime’s methods of mass murder evolved from mobile operations to industrial-scale extermination camps, a shift driven by the desire for greater efficiency and reduced psychological strain on perpetrators.12

Mobile Killing Units (Einsatzgruppen)

Beginning in June 1941, Einsatzgruppen followed the German army into Soviet territories. These mobile units operated by entering towns, rounding up victims—primarily Jews, Roma, and Soviet officials—and executing them via mass shootings at nearby sites like Babi Yar. This process was physically and psychologically taxing for the killers, and the public nature of the shootings was often disquieting to local populations.312

Extermination Camps

To streamline the genocide, the Nazis transitioned to stationary extermination camps, such as Auschwitz, Treblinka, and Belzec. This approach reversed the logistics: instead of killers traveling to victims, victims were transported by rail to centralized facilities.2

Key differences included:
* Efficiency: Camps allowed for the murder of large numbers of people with a minimal number of personnel.2
* Methods: While mobile units relied on gunfire and later mobile gas vans, camps utilized stationary gas chambers disguised as showers, employing carbon monoxide or Zyklon B.12
* Scale: Camps integrated industrial processes, such as connected crematoria, to dispose of bodies systematically.12