The former chief compliance officer at cryptocurrency exchange FTX paid off whistleblowers and their lawyers trying to expose the company’s fraud, according to a lawsuit filed in bankruptcy court by FTX and its debtors.

Daniel Friedberg, a longtime outside counsel for FTX and its former Chief Executive Sam Bankman-Fried, was formally hired in January 2020, according to the complaint filed in U.S. Bankruptcy Court for the District of Delaware on Tuesday.