United for a Fair Economy and Public Citizen released a new report unveiling the 18 mega-rich families who are the primary finacial influence behind the decades long effort to repeal the estate tax. As detailed in the report, Spending Millions to Save Billions, the families include the candy magnate Mars family, the Waltons - owners of Wal-Mart stores, the Gallo wine dynasty, the Kochs of Koch Industries and Dorrance family of the Campbell’s Soup Company. Together, they are worth a total of $185.5 billion and would save upwards of $71.6 billion if the tax was repealed.