The Sackler family owns Purdue Pharma, which made billions of dollars selling OxyContin, an opiate painkiller stronger than morphine. Introduced in 1996, OxyContin has been largely blamed for the opioid addiction crisis that followed. The Sacklers and the company are currently facing more than 2,500 lawsuits related to its practices. We talk with journalist Patrick Radden Keefe about the development of OxyContin, what the family knew about the danger of the drug, and how they have tried to thwart his reporting. His book is 'Empire of Pain.'