The correct answer is: "Jews".
Since the nazi party arrived to the German goverment, they started to enact discriminative laws against Jews. First of all, they forced Jews to differentiate themselves from other citizens by wearing a star. Afterwards, Jews were forced to live in ghettos (separated areas in cities).
Finally, as part of the policy called 'Final Solution to the Jewish Question', Jews started to be deported to either concentration camps where they were forced to hard labor until death, or to extermination camps were they were automatically killed.
The aim pursued by the nazis was to purify the German race, that was being spoilt by mixing with Jews who were blamed by Hitler for all the penalties that the German population had suffered in the former decades: losing the war, destruction, economic crisis, hunger, etc.
