You can look this up easily. But the physical features of the Jewish population where well known and used in nazi-propaganda.

Wikipedia:

Jewish people, are an ethnoreligious group

An ethnoreligious group is a group of people with a common religion and ethnic background

An ethnicity or ethnic group is a group of people with shared attributes. … It is also used interchangeably with race.[7]

White on white can still be racism. There are subtle differences between nations.

“Jews” is actually a good example. Its both a religion and a race.

Its actually quite telling how when the less different looking people there are the more we start hating on even the smallest physical differences.