Discuss the caste-based discrimination present in Rabindranath Tagore's 'punishment.

Brothers Dukhiram Rui and Chidam Rui not only work in the fields together, but live together on the same land. Every day, while they are out, their wives Radha and Chandara quarrel loudly with each other, and the whole village hears their screaming. Since they are all of a lower caste, life is hard for them—often Dukhiram and Chidam are cheated out of their rightful wages for their work.