On July 3rd, 1947, the day observed as 'Black Day' against the Partition of India was initiated by the Hindu Mahasabha. This organization strongly opposed the division of India as proposed by the British government, which eventually led to the creation of two separate nations - India and Pakistan. The Hindu Mahasabha viewed the partition as a tragic event in Indian history, resulting in the displacement of millions of people and significant communal violence. As a form of protest, the Hindu Mahasabha declared July 3rd as 'Black Day' to express their discontent and rally against the decision.