ghetto

(noun) formerly the restricted quarter of many European cities in which Jews were required to live. Example: "The warsaw ghetto."

(noun) any segregated mode of living or working that results from bias or stereotyping. Examples: "The relative security of the gay ghetto." "No escape from the ghetto of the typing pool."

(noun) a poor densely populated city district occupied by a minority ethnic group linked together by economic hardship and social restrictions.