What does Dorothy threaten in order for the Wizard to see them in 'The Wizard of Oz'?

Call in the Winged Monkeys is what Dorothy threatens in order for the Wizard to see the five friends in "The Wizard of Oz."

Specifically, the threat is made in the original 1900 book edition but not the beloved 1939 movie classic. Dorothy has the Golden Cap by which the Winged Monkeys are summoned to carry out three commands. She frightens the Wizard into seeing them because she warns that the Winged Monkeys will look into the Wizard keeping his promises to help the five friends