Other than jews who were the other groups in the holocaust

While Nazi ideology targeted Jews as the primary enemy of Germany, the Nazis also targeted Roma (Gypsies) on racial grounds. The 1935 Nuremberg Laws (which defined Jews by blood) were later applied to Roma. Drawing on traditional prejudices in German society, the Nazis termed Roma as prone by race to be "work-shy" and "asocial" with an inherited inclination to engage in petty crime. Among the first killed in the mobile gas vans at the Chelmno killing center in German-occupied Poland in early 1942 were Roma deported from the Greater German Reich to the Lodz ghetto. SS and police authorities deported more than 20,000 Roma to the Auschwitz-Birkenau camp, where the camp authorities killed almost all of them in the gas chambers.

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live

to replace ineffective because   andrew jackson's spoil system was a deliberate policy after he became president to remove federal employees he considered to be political opponents and replace them with his own supporters.