Who is the author of the famous book 'Gulamgiri'?

Explanation

The upliftment of the backward classes was the main programme of the Satyashodhak Samaj, which was founded by Jyotiba Phule in 1873. This movement worked for the welfare of Dalits and lower-caste people. To spread his anti-Brahmanical activities in an organised manner, he wrote critical works like ‘Sarvajanik Satya Dharma Pustak’ and ‘Gulamgiri’.