United Auto Workers and the US law firm have reached an agreement on a massive bribery and embezzlement scandal.
The terms of the deal will be announced in Detroit on Monday, but part of the deal is to reform the union following the scandal.
The investigation has resulted in 11 convictions over the years, including two former UAW presidents.
Many of the officials were charged with conspiring with others to cover up the use of union money on meals, premium cigars, golf and lodging in Palm Springs, California.
The civil law regime is likely to include an independent observer to oversee the finances of the 400,000 member unions.