A year after suing their company Purdue Pharma and others for $500 million, New York City formally accused the wealthy Sackler family of participating in a decades-long campaign to mislead the public about the dangers of OxyContin.

“It is important to note that the Sacklers personally derived billions of dollars of profits from Purdue Pharma’s sale of opioids since the 1980s,” New York City Corporation Counsel Zachary Carter said in a statement on Wednesday.