Answer:
Jews
Step-by-step explanation:
Adolf Hitler, the head of the Nazi party, felt that the "Aryan" race (blond hair, blue eyes, picture-perfect) was superior to all. So, he discriminated against a lot of Germans who were not "Aryan".
One specific group he targeted was the Jewish population. He ordered the Nazis to commit horrendous acts towards the Jews, including forcing them to wear arm bands with the Star of David, shutting down their businesses, and sending them to concentration camps where they either starved to death or died from chemical inhalation.
Technically, the Jews were the main group the Nazis targeted. However, there were also a few other groups, as well, including gypsies and homosexuals.