brain trust

мозговой трест

I am not sure how to translate this one correctly since I've been fuzzy about this for quite a long time. Is it a 'mastermind' behind some scheme or a group of people in charge of making successful strategies to promote a campaign/product?
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The "brain trust" was the name given to a diverse group of academics who served as advisers to President Franklin D. Roosevelt. The group was first suggested in March 1932.