Theese marginalized communities belong to the deepest step of Indian caste system, a system that divides Indian society in 4 castes: Brahmin, “Kshatriyas”, “Vysya” and “Sudra”. Unlikely these 4 social groups, untouchables are excluded from the caste system and are considered inferior to the other members of the castes, who avoid and discriminate them, because they fear that, by touching or looking at them, they could become impure them-selves, since untouchables have been related to activities considered impure by tradition, as for the tanning leather, corpse-handling or the cleaning. Untouchables or outcasts are in the most marginalized groups. We are not talking about a small minority, but about 20% on Indian population.