From scoopwhoop.com: After gaining independence from British Raj, India was to be divided into two separate countries (India and Pakistan). A major population exchange happened with around 25 million people relocating to their new homes and what followed was complete chaos. A large evil loomed over the population that was shifting to a new country once the borders were drawn. Religious riots along with acts of oppression and cruelty marked this huge event as a dark blot on the history of the two countries.

An appendix of resources on Partition from The University of Texas at Austin's South Asia department.