I was able to find a kickback allegation that happened very recently, this past September 2017. It involves Galena Biopharma with a prescription opioid scheme. Galena Biopharma had to pay more than $7 million in the settlement. Two of the doctors involved actual went to jail for over 20 years. The doctors were prescribing these opioid drugs to people who did not need that in exchange for money. The article is pretty interesting please see the link below:
http://www.raps.org/Regulatory-Focus/News/2017/09/08/28439/Galena-Biopharma-Settles-Opioid-Kickback-Allegations/