BOSTON (Reuters) – The founder of Insys Therapeutics Inc on Thursday became the highest-ranking drugmaker executive convicted in a case tied to the U.S. opioid crisis, when he and four colleagues were found guilty of bribing doctors to prescribe an addictive painkiller, helping drive the epidemic.

FILE PHOTO: John Kapoor (R), the billionaire founder of Insys Therapeutics Inc., leaves the federal courthouse during the trial accusing Insys executives of a wide-ranging scheme to bribe doctors to prescribe an addictive opioid medication, in Boston, Massachusetts, U.S., March 13, 2019. Picture taken March 13, 2019. REUTERS/Brian Snyder

A federal jury in Boston found John Kapoor, 75, the drugmaker’s former chairman, and his co-defendants guilty of racketeering conspiracy for a scheme that also misled insurers into paying for the