Kulin Brahmins are those Brahmins in Bengal who can trace themselves to the five families of Kanauj (Kanyakubja), Uttar Pradesh who migrated to Bengal.They were given immense power during the reign of the Sena/Sen kings who were staunch Hindus and did not encourage the practice of any other religion.
From 1822, over 500 secular Kulin Brahmins of Calcutta organised themselves into a vigilante force under legal experts like Ram Mohan Roy, Dwarkanath Tagore and Prasanna Coomar Tagore known as the Brahma Sabha to report and prosecute such offences.