The Nazis persecuted those they considered to be racially inferior. Nazi racial ideology primarily vilified Jews, but also propagated hatred for Roma (Gypsies) and Black people. The Nazis viewed Jews as racial enemies and subjected them to arbitrary arrest, internment, and murder. Roma were also singled out on racial grounds for persecution. The Nazis viewed Poles and other Slavs as inferior, and slated them for subjugation, forced labor, and sometimes death. Jewish prisoners received the most brutal treatment in Nazi concentration camps.