But a copy of a confidential Justice Department report shows that federal prosecutors investigating the company found that Purdue Pharma knew about “significant” abuse of OxyContin in the first years after the drug’s introduction in 1996 and concealed that information.

Company officials had received reports that the pills were being crushed and snorted; stolen from pharmacies; and that some doctors were being charged with selling prescriptions, according to dozens of previously undisclosed documents that offer a detailed look inside Purdue Pharma. But the drug maker continued “in the face of this knowledge” to market OxyContin as less prone to abuse and addiction than other prescription opioids, prosecutors wrote in 2006.

Based on their findings after a four-year investigation, the prosecutors recommended that three top Purdue Pharma executives be indicted on felony charges, including conspiracy to defraud the United States, that could have sent the men to prison if convicted.