The correct answer is option 3, All India Scheduled Castes Federation. The All India Scheduled Castes Federation was established by B.R Ambedkar.
Option 1, Swaraj Party, was a political party formed by Motilal Nehru and Chittaranjan Das in 1923, and it was not established by B.R Ambedkar.
Option 2, Samaj Samata Party, was a political party formed by Narayan Guru and Periyar Ramasamy in 1924, and it was not established by B.R Ambedkar.
Option 4, The Independent Labour Party, was a political party formed by N.M. Joshi and Shripad Amrit Dange in 1936, and it was not established by B.R Ambedkar.
Therefore, the correct option is option 3, All India Scheduled Castes Federation, which was established by B.R Ambedkar.