Official Languages Act, 1963
The Official Languages Act, 1963 is an act of the Parliament of India which designates which of the official languages of India are the language of government. == History == The act was passed to pre-empt protests in certain southern states, such as Tamil Nadu, where there was significant opposition to the "imposition" of Hindi.
Source: Wikipedia — Official Languages Act, 1963 (CC BY-SA 4.0)