
1) Certain advisers of FDR 2) High-level advisory group 3) New Deal advisory group
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https://www.crosswordclues.com/clue/brain-trust

Brain trust began as a term for a group of close advisers to a political candidate or incumbent, prized for their expertise in particular fields. The term is most associated with the group of advisers to Franklin Roosevelt during his presidential administration. More recently the use of the term has expanded to encompass any group of advisers to a...
Found on
http://en.wikipedia.org/wiki/Brain_Trust

in U.S. history, group of advisers to Franklin D. Roosevelt during his first campaign for the presidency (1932). The term was coined by journalist ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/b/105

Nickname of an informal group of experts who advised US president Franklin D Roosevelt on his
New Deal policy. ...
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http://www.encyclo.co.uk/local/20688

a group of experts from various fields who serve as unofficial consultants on matters of policy and strategy.
Found on
https://www.infoplease.com/dictionary/brain-trust
No exact match found.