As a rule, linguistic diversity has little to do with racial diversity. However, studies in Africa, Europe, and North and South America have documented that standard and nonstandard dialects are often divided along socially and racially stratified lines. Results in this discussion grow from studies of linguistic profiling in France, South Africa, and the USA regarding the devaluation of Black Speech. Studies of housing discrimination against Blacks and Latinos in the USA, along with preliminary analyses of linguistic attitudes throughout the African diaspora, reveal that employment, education, housing, and access to other goods and services may be influenced by linguistic stereotypes. Here we explore various interdisciplinary controversies that are closely intertwined, with primary emphasis on the USA, where studies in linguistic profiling are most advanced. Experiments that build upon Lambert's classical matched guise technique explore various demographic characteristics that listeners attribute to someone based on the sound of his or her voice, such as during a telephone conversation. These experiments are linked directly with attempts to advance racial justice in education, law, health care and economic transactions, along with corresponding policy implications.