Mala Pilla

Malapilla or Mala Pilla Telugu Maalapilla was a 1938 Telugu Blockbuster film, that brought the social evil caste system into the limelight. It was directed by Gudavalli Ramabrahmam. It is based on a social drama taking Gudipati Venkatachalams story Mala Pilla, a love story between a Brahmin boy and a Harijan girl. The film dealt with the crusade against untouchability, prevailing in preindependent India.

Source: Wikipedia