Some economists consider the 2008 bank bailouts in the United States to be corporate welfare. U.S. politicians have also contended that zero-interest loans from the Federal Reserve System to financial institutions during the global financial crisis were a hidden, backdoor form of corporate welfare. The term gained increased prominence in 2018 when Senator Bernie Sanders introduced a bill, singling out Amazon and Walmart in particular, to require a company with 500 or more employees to pay the full cost of welfare benefits received by its workers.