The Bhagalpur blindings refers to an incident in 1979 and 1980 in Bhagalpur

Bhagalpur

Bhagdattpuram was one of the most influential towns in "Aryavarta" . It is supposed to have been concurrent to Patliputra or Patna. Bhagdattpuram finds its mention in the Vedas and Ramayana as well. It is supposed to be the kingdom of Daanvir Karna, the son of Kunti and the Sun God...

 in the state of Bihar, India when police blinded 31 undertrials (or convicted criminals, according to some versions), by pouring acid into their eyes. The incident became infamous as Bhagalpur blindings.
The incident was widely debated and discussed by several human rights organisations.

In 2003, a Bollywood

Bollywood

Bollywood is the informal term popularly used for the Hindi-language film industry based in Mumbai , Maharashtra, India. The term is often incorrectly used to refer to the whole of Indian cinema; it is only a part of the total Indian film industry, which includes other production centers producing...

 movie loosely based on the incident and starring Ajay Devgan

Ajay Devgan

Ajay Devgan , born Vishal Veeru Devgan on 2 April 1969, is an Indian film actor, director, and producer.He made his film debut with Phool Aur Kaante in 1991 and received a Filmfare Award for Best Male Debut for his performance in the film and for which he won a Filmfare Best Debut Award...

 was released. It was titled Gangaajal

Gangaajal

Gangaajal was 2003 Hindi film, directed by Prakash Jha, and was the brain child of Mr. Mahendra Lalka, starring Ajay Devgan, Gracy Singh, and Mukesh Tiwari...

(roughly translated as The holy waters of Ganga).