The phrase "the blue book crowd" typically refers to a group of wealthy, elite individuals who belong to prestigious clubs and organizations. Synonyms for this phrase might include "the upper crust," "the social elite," "the cream of the crop," or "the high society set." Other terms that could be used to describe this group might include "the jet set," "the beautiful people," or "the aristocracy." Overall, these terms all denote a group of people who are at the top of their social and financial spheres, and who often have access to exclusive privileges and opportunities that are not available to the general public.