checking the facial characteristics of a
Romani woman, as part of her racial studies During the 1930s and 1940s, institutes in
Nazi Germany studied genetics, created genetic registries and researched twins. Nazi scientists also studied blood, and developed theories on the supposed racial specificity of blood types, with the goal of distinguishing an "Aryan" from a
Jew by examining their blood. In the 1940s,
Josef Mengele, a doctor in the
Schutzstaffel (
SS), provided human remains that were taken from
Auschwitzblood, limbs and other body partsto be studied at the institutes. Harnessing racial hygiene as a justification, the scientists used prisoners from Auschwitz and other concentration camps as test subjects for their human experiments. In the 1930s, under eugenicist
Ernst Rüdin,
National Socialist ideology embraced this latter use of "racial hygiene", which demanded Aryan racial purity and condemned
miscegenation. That belief in the importance of German racial purity often served as the theoretical backbone of
Nazi policies of racial superiority and later
genocide. The policies began in 1935, when the National Socialists enacted the
Nuremberg Laws, which legislated racial purity by forbidding sexual relations and marriages between Aryans and non-Aryans as
Rassenschande (racial shame).
and hereditarily unfit'' under the Nazi regime as a result of his
mixed race heritage Racial hygienists played key roles in the
Holocaust, the German National Socialist effort to purge Europe of Jews,
Romani people,
Slavs,
Blacks,
mixed race people, and
physically or
intellectually disabled people. In the
Aktion T4 program, Hitler ordered the execution of mentally-ill patients by
euthanasia under the cover of deaths from strokes and illnesses. A key aspect of
National Socialism was the concept of racial hygiene and it was elevated to the primary philosophy of the German medical community, first by activist physicians within the medical profession, particularly amongst psychiatrists. That was later codified and institutionalized during and after the Nazis' rise to power in 1933, during the process of
Gleichschaltung (literally, "coordination" or "unification"), which streamlined the medical and mental hygiene (mental health) profession into a rigid hierarchy with National Socialist-sanctioned leadership at the top. The blueprint for Nazism's attitude toward other races was written by
Erwin Baur,
Fritz Lenz, and
Eugen Fischer and published under the title
Human Heredity Theory and Racial Hygiene (1936). == After World War II ==