 In the slave castes, they recognized two layers, the "`Abid" (slaves) and "Haratins" (freed slaves).According to Remco Ensel – a professor of Anthropology specializing in Maghreb studies, the word "Haratin" in Moroccan is a pejorative that connotes "subordination, disrepute" and in contemporary literature, it is often replaced with "Drawi", "Drawa", "Sahrawi", "Sahrawa" or other regional terms.The "Haratins" historically lived segregated from the main society, in a rural isolation.