Scheduled Castes

[politically correct] legal term for the so-called low castes

Synonmyms: 

* Harijans (Sons of Hari; the name given by Mahatma Gandhi) 
* Dalits (depressed classes) 
* weaker sections 

Scheduled Castes (SCs) along with Scheduled Tribes (STs) have traditionally occupied the bottom strata of the Indian caste heirarchy.