Otto Reche

He claimed that the three blood types, A, B, and O, were each originally attached to European, Asian, and Native American races, but that interracial marriage had diluted this over the centuries.

[2] Reche justified the invasion of Poland in 1939 in a letter to Albert Brackmann arguing: we need Raum but no Polish lice on our fur.

I am absolutely of the opinion that the racial-scientific side is determinative in the solution of all these questions since we do not want to build a German people in the East in the future that would only be a linguistically germanised, racial mish-mash, with strong asiatic elements, and Polish in character.

In this position he wrote about ethnic Poles, claiming that they are an "unfortunate mixture" consisting among others of Slavs, Balts and Mongolians and that they should be eliminated to avoid possible mixing with the German race.

[1] In 1959, Reche was chosen by a German court investigating the claims of Anna Anderson that she was Anastasia Nikolaevna, a Russian Grand Duchess thought to have been murdered along with the rest of the royal family.