One of the world’s largest consulting firms has agreed to pay over half a billion dollars to resolve a U.S. investigation into its role in advising drug companies how to ‘supercharge’ opioid sales while the country was suffering from an opioid epidemic.

South African prosecutors moved to freeze US$ 130 million worth of assets held by McKinsey & Co. and Trillian Capital Partner, a company with close ties to the allegedly corrupt Gupta family, Bloomberg reported on Tuesday.