Wikipedia
The Razakars were a private militia organised by Qasim Razvi to support the rule of Nizam Osman Ali Khan, Asaf Jah VII and resist the integration of Hyderabad State into the Dominion of India. They also attempted to make the Nizam accede his princely state to Pakistan instead of India. The Razakars were affiliated to the Majlis-e-Ittehadul Muslimeen political party.
To counter the Razakars, people of Telangana under the leadership of Swami Ramanand Tirtha formed the Andhra Hindu Mahasabha which sought integration of the state with rest of India. Razakars were responsible for the killing, rape, and brutal murder of many people in the Telangana and Marathwada region who were driven out. Eventually, the Indian Army routed the Razakars during Operation Polo. Qasim Razvi was initially jailed and then allowed to move to Pakistan where he was granted asylum.