The practice of untouchability is indeed reprehensible and must be condemned by one and all; but that does not mean that we should now begin to regard it as a form of racial discrimination. The Scheduled Castes of India taken together are no more a race than are the Brahmins taken together. Every social group cannot be regarded as a race simply because we want to protect it against prejudice and discrimination.
Beteille (2001) in: "The Hindu : Discrimination that must be cast away" at Hinduonnet.com, June 3, 2001