What are some groups that suffered discrimination?

Somewhat longer ago: Blacks in the US and other countries; every other not 100% white person in South Africa before 1990; Japanese people in the US during WW2; women in the workforce; Jews in pre-war Germany; muslims in non-muslim countries; shiite muslims in predominantly sunnite muslim countries or areas; sunnites in predominantly shiite muslim countries or areas; the 'untouchables'-caste in India; people of Korean descent in Japan; aboriginals in Australia; native Indians in the US; older people looking for jobs; Coptic Christians in Egypt; homosexuals. With a little effort this list could easily be made three times as long.