smoke-filled room

Typically a place where secret political deal-making occurs. In earlier times, many political operatives smoked cigars which filled the rooms with smoke.

Encyclopedia of Chicago: “The original smoke-filled room was in Chicago’s Blackstone Hotel, where, according to an enduring legend, a small group of powerful United States senators gathered to arrange the nomination of Warren G. Harding as Republican candidate for president in 1920… when the Associated Press reported that Harding had been chosen ‘in a smoke-filled room,’ the phrase entered the American political lexicon. Ever since, ‘smoke-filled room’ has meant a place, behind the scenes, where cigar-smoking party bosses intrigue to choose candidates.”