Adamic was strongly opposed to the foreign policy followed by British Prime Minister Winston Churchill, and in 1946 wrote "Dinner at the White House" which purported to be an account of a dinner party given by President Franklin D. Roosevelt at which Adamic and Churchill had both been present. After the proofs had been passed by publishers Harper and Brothers, an additional footnote was inserted in pages 151 and 152 which claimed that Churchill had opposed the National Liberation Front in Greece because they intended to scale down the rate of interest Greece was paying to Hambros Bank. The footnote further claimed that Hambros had "bailed Winston Churchill out of bankruptcy in 1912". The footnote appeared in the book when it was published, and a copy was circulated to every British Member of Parliament; when Churchill was alerted, he instructed his solicitors to issue a writ for libel. Harper and Brothers admitted the statement was untrue and Adamic also withdrew the claim and apologised; a substantial sum of damages was paid, reported by the Daily Express as £5,000. As of 2011 the copy of "Dinner at the White House" in the British Library is held in the 'Suppressed Safe' collection, inaccessible to readers.
According to John McAleer's Edgar Award-winning "Rex Stout: A Biography" (1977), it was the influence of Adamic that led Rex Stout to make his fictional detective Nero Wolfe a native of Montenegro, in what was then Yugoslavia.