𝐓𝐡𝐞 𝐟𝐨𝐮𝐫 𝐠𝐫𝐚𝐝𝐞𝐬 𝐨𝐟 𝐫𝐚𝐜𝐢𝐚𝐥 𝐜𝐥𝐚𝐬𝐬𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐭𝐨 𝐛𝐞 𝐚𝐜𝐜𝐞𝐩𝐭𝐞𝐝 𝐛𝐲 𝐭𝐡𝐞 𝐒𝐒 𝐫𝐚𝐜𝐞 𝐨𝐟𝐟𝐢𝐜𝐞

"The office of the SS Race and Settlement Main Office, integrated into the central office of the Chief of the Security Police and the SD, was tasked with the racial examination of returnees aged 6 and older. Similar to the initial examination for admission to the SS, the classification into different groups took place, with Group I being broadly defined as above average for the German people, Group II as average, Group III as below average, and Group IV as unsuitable for deployment in the new eastern territories of the Reich."

The criteria for classification into the four racial rating groups at the Immigration Central Office:

"𝐑𝐚𝐭𝐢𝐧𝐠 𝐋𝐞𝐯𝐞𝐥 𝐈: Purely Nordic or purely Westphalian persons who are also of first-class genetic health and performance.

𝐑𝐚𝐭𝐢𝐧𝐠 𝐋𝐞𝐯𝐞𝐥 𝐈𝐈: Predominantly Nordic or Westphalian, with a slight Dinaric or Western influence. Furthermore, harmonious mixtures between Nordic and Westphalian with Dinaric and Western. Finally, Dinarics who are not too foreign to the German sense of identity.

𝐑𝐚𝐭𝐢𝐧𝐠 𝐋𝐞𝐯𝐞𝐥 𝐈𝐈𝐈: Few balanced mixed-race individuals with a predominantly Dinaric or Western component; furthermore, mixed-race individuals with an Eastern or East Baltic influence.

𝐑𝐚𝐭𝐢𝐧𝐠 𝐋𝐞𝐯𝐞𝐥 𝐈𝐕: Completely unbalanced mixed-race individuals. Pure Eastern or East Baltic. People of non-European descent. People of foreign blood. People with hereditary diseases. People whose appearance is unacceptable."

The NSDAP was Nordicist, they viewed Slavs as racially Eastern and favored a Nordic racial body. They rejected Slavs who were not Nordic and wanted to colonize all of Eastern Europe to Germanize some of them and expel the rest to Siberia (Generalplan Ost).

Source: BArch R 69/178 Richtlinien für die ärztliche und erbbiologische Beurteilung der Umsiedler, 1941. p.1 and p.3.

@Hateslav