Even though they are not specifically mentioned in theNuremberg Laws of 1935 as non-Aryan, by 1937, those
statutes were extended to include them and to define them as unassimilable
with Aryan blood.
This has a lot of topics:Hitler, Victims of the holocaust: Jews, Gypsies, Jehovah's Witnessess, and Anne Frank, The concentration camps, and survivors.