Pharmaceutical giant Purdue Pharma LP secretly pursued a plan, dubbed Project Tango," to become "an end-to-end pain provider" by selling both opioids and drugs to treat opioid addiction, all while owners on the board - members of one of America's richest families - reaped more than $4 billion in opioid profits, according to a lawsuit newly unredacted. The suit says the company and its owners, the Sackler family ... engaged in a decade of deception to push their pharmaceuticals, namely the painkiller OxyContin, on doctors and patients, publicly denying what internal documents show they privately knew to be true: that the highly addictive drugs were resulting in overdoses and deaths. Purdue examined selling overdose antidotes, including Narcan, as "complementary" products to the same doctors to whom it sold its opioids, the lawsuit claims, and although the company maintained a ledger of doctors it suspected of inappropriate opioid prescriptions and other forms of abuse, dubbed "Region Zero," it continued to collect revenue from those doctors. The Sacklers paid themselves more than $4 billion in opioid profits between April 2008 and 2018. In 2017, there were 47,600 opioid-linked drug fatalities in the United States. The unredacted complaint also says consulting firm McKinsey & Co. played a crucial role in advising the company on how to push its product on doctors and boost its profits.