(November 29, 2018, 11:17 AM EST) -- BOSTON — A former vice president of sales for opioid maker Insys Therapeutics Inc. on Nov. 28 pleaded guilty to racketeering and will cooperate with the federal government’s case against six other company executives, according to a docket entry for the case in the U.S. District Court for the District of Massachusetts (United States v. Alec Burlakoff, No. 16-cr-10343, D. Mass.)....