Under the Poona Pact, Untouchables had to give up their separate electorate and be part of joint electorates with Hindus. They also had to give up the unique political weapon Ambedkar had won for them—the second vote that would give them a say in the election of caste-Hindu candidates in their constituency. All that remained for Scheduled Castes was a reserved seat whose holder would be selected by the general population. The Scheduled Caste representative would, in effect, be selected by the very caste-Hindu majority that had already proved its hostility to Scheduled Caste political aspirations.

Ambedkar, B R, Annihilation of Caste_ The …, loc. 1312