Short answers, pulled from the story.
The Sarvadeshik Hindu Sabha, later renamed Akhil Bharatiya Hindu Mahasabha, was established on the 13th of February 1915. Madan Mohan Malviya founded the organization to advocate for Orthodox Hindus within the British Raj.
Vinayak Damodar Savarkar transformed the party into a distinct political force during the 1930s by developing the concept of Hindutva. He served as president when the Mahasabha opposed secular nationalism espoused by the Congress and developed Hindu Militarisation Boards that recruited for British armed forces.
The Hindu Mahasabha supported the British war effort during World War II despite earlier opposition to colonial rule because they formed coalitions with the Muslim League in provincial and central legislative councils between 1939 and 1943. They believed these coalition governments functioned successfully and Savarkar appreciated their operation while opposing integration of princely states into independent India.
Nathuram Godse assassinated Mahatma Gandhi in New Delhi on the 30th of January 1948 along with fellow conspirators Digambar Badge, Gopal Godse, Narayan Apte, Vishnu Karkare, and Madanlal Pahwa who were prominent Hindu Mahasabha members. Police arrested Vinayak Damodar Savarkar who was suspected of being the mastermind behind the plot but he was released due to lack of evidence.
Electoral history shows seats won by the Hindu Mahasabha dropping from four in the first Lok Sabha election of 1951 to zero by 1967. The party failed to win any seats in subsequent elections through 2024 except for isolated instances and was soon eclipsed by the Bharatiya Jana Sangh which absorbed much of its support base.
In 2015 Vice President VP Sadhvi Deva Thakur stated Christians and Muslims must undergo forced sterilisation because population growth among these groups threatens Hindus. In September 2021 Dharmendra state general secretary in Karnataka threatened to kill Chief Minister Basavaraj Bommai over demolition of an unlicensed temple in Nanjangud Mysuru.