Question

who were considered undesirables by the nazis

Answer 1

The Nazis considered mainly the Jews and disabled Germans as the undesirables...
The Gypsies polish civilians etc were also included in the list..
Those who weren't blue eyed and blonde and didn't have sharp nose features weren't considered to be the fit descendants of the mighty Aryans and were thus considered undesirables...
Hope that helps you!!

Answer 2

the undesirables included:
-Jews
-Handicapped and unhealthy people
-Gypsies
-anyone who isn't blue eyed and blonde.
-anyone who opposes this belief.
-people who are related to Jews. 
-did I mention Jews?
-Oh, Jews.