“Brains Trust: Nickname given to a group of economists and businessmen in the USA who acted as advisers to Pres. Roosevelt (1882-1945) in formulating the New Deal policy. The term has since been widely used to denote bodies of experts believed to have influence on government policy. In the UK the term ‘brains trust’ was extended to include groups of experts assembled to answer questions put to them by the public, especially the BBC’s wartime panel of experts who broadcast on the wireless.”
Excerpted from: Cook, Chris. Dictionary of Historical Terms. New York: Gramercy, 1998.