The affluent Sackler family faces new allegations fraudulently transferred from Purdue Pharma, the company that makes opioid analgesics.
In a lawsuit, the New York Attorney General said she would reclaim "billions of dollars" fraudulently transferred from the firm to the dynasty.
Purdue faces thousands of lawsuits for the commercialization of OxyContin, but only a handful have called the Sacklers
. Purdue and the Sacklers vigorously deny the allegations, a spokesman said.
A spokesman for the Sackler family said: "The extension of this groundless lawsuit to former directors of Purdue Pharma is a misguided trial site where it does not belong to a complex public health crisis.
The family" denies "the Allegations are "strong" and will "vigorously defend against them."
The lawsuit alleges that money from Purdue Pharma has been transferred to individuals offshore accounts held by members of the Sacklers to protect the funds from litigation
The Sackler family, according to Forbes Magazine, is worth $ 1
Dame Theresa Sackler, named in the lawsuit is, is a trustee of the V & A in London, which has a yard named after the family.
The Sackler Trust, however, has now more new ones exposed to donations in the UK. This is followed by a decision by the National Portrait Gallery to give up a grant from the Trust.
Other organizations have also shunned Sackler's money, including Tate.
New York Attorney General Letitia James filed a lawsuit against Purdue Pharma last August, claiming that she exaggerated the benefits of OxyContin to adequately address the potential risks of taking the drug, including "severe abuse and death ".
This lawsuit has now been extended to the Sacklers, many of whom were directors of Purdue.
It has also been expanded to trusts controlled by the Sackler family and other manufacturers and distributors of opioid medications.
These include Janssen Pharmaceuticals, owned by Johnson & Johnson and Teva Pharmaceuticals.