Lorenz Hackenholt

In 1933, Hackenholt volunteered for the SS. After joining the SS he was sent to a training school on 1 January 1934. After that he volunteered for service in the army, where he was assigned to the 12th Engineers' Battalion. After two years military service he was discharged, and then joined the SS Death's Head troops. He was a skilled driver and mechanic and, beginning in March 1938, served at Sachsenhausen concentration camp in the motor pool. He also worked as a guard at Sachsenhausen.[3]

Action T4, the so-called "Euthanasia Program", lasted from early 1940 until the summer of 1941 when the gassings were stopped on Hitler's orders. In November 1939 Hackenholt was assigned to Action T4, when he was transferred to Berlin for 'special duty'.[3] This special duty was under Viktor Brack. According to Werner Karl Dubois, another camp guard transferred to special duty with Hackenholt:

Photographs of extreme cases of mental illness were shown to us. We were told that ... the institutions from which the mentally ill were to be taken were needed as military hospitals. We were further told that gas chambers were to be built in which the victims would be gassed, after which they would be cremated. We, anyway, would have nothing to do with the killings, we would only have to cremate the corpses.[3]

There were six T4 killing facilities. Hackenholt served in all of them. He drove a bus with the SS staff from facility to facility. He also removed the bodies from the gas chambers and burned them. For a while Hackenholt was a driver for SS-Untersturmführer Dr. August Becker, the T4 chemist who was responsible for delivering bottled carbon monoxide gas from I.G. Farben manufacturing plants to the T4 gas chambers.[3] Hackenholt worked primarily in Grafeneck and Sonnenstein.[4]

SS staff at KZ Belzec. Hackenholt is third from the right (front row).

In the fall of 1941, some of the Action T4 personnel, including Hackenholt, were transferred to Lublin Reservation in occupied Poland where they came under the authority of SS-Brigadeführer Odilo Globocnik. On vacation leave, Hackenholt went to Berlin to marry Ilse Zillmer, who was then 29 years old. Hackenholt returned to Poland and was sent to Bełżec, a remote labour camp near the rail station,[5] to conduct experiments to establish a method for the mass killing of Jews by gassing. Hackenholt set up three gas chambers in an insulated barracks. Using engine exhaust, piped into the chambers from a disassembled Soviet tank, Hackenholt killed over 50,000 Jews in one month (mid March to mid April 1942). In August 1942, Hackenholt built and operated newer and larger gas chambers at Belzec. Once Belzec came into operation, a sign was placed over the gas chambers which said "Hackenholt Foundation"; with potted geraniums on either side of the entrance.[2] Hackenholt also designed and operated gas chambers at the Treblinka and Sobibor extermination camps.[3]

Hackenholt, who was called "Hacko" by other guards, was a tough, large man who was willing and able to do any task at the extermination camps, although he reportedly balked at cleaning up seeping corruption from bodies rotting in mass graves.[3] At Belzec, where all ages of people were killed, some Jews, because of infirmity or age, could not enter the gas chamber. These people were instead laid down in the mass graves, and, according to the testimony of other guards, shot by Hackenholt. In 1943, when Himmler ordered the mass graves at Belzec to be reopened and the bodies burned, Hackenholt was in charge of the operation.[3] Himmler considered Hackenholt to be "one of the most deserving men of Operation Reinhard" (German: einer der verdientesten Männer der Aktion Reinhard).[4]

In December 1943, Hackenholt and other personnel from Operation Reinhard were transferred to northern Italy (Trieste),[4] where they attempted to find and kill the few remaining Italian Jews. In 1944 Hackenholt was awarded the Iron Cross (Second Class) for his role in Operation Reinhard.[3]

Colleagues from Einsatz R were last seen in Austria the time of his unit's retreat. On the way to Kirbach, their car column was supposedly to evad a horse-drawn dairy car driven by Hackenholt[6]..

In the summer of 1945, rudolf Kamm, an essayist from the Bełżec crew, was to report to Hackenholt's wife Ilse (née Zillmer, b. 1912), who was in Berlin at the time. He claimed that Hackenholt sent him to his wife to give him civilian clothesthrough him.