Bailum and Barney's Great Consolidated Shows is an American circus featuring three rings in one tent and a menagerie on the side. The great Oz worked for the circus as a balloonist, going up in a hot-air balloon to attract crowds. (The Wonderful Wizard of Oz, Dorothy and the Wizard in Oz)

This is likely a reference to the real life "Barnum & Bailey's Greatest Show on Earth", which was founded in 1881 and well known when the early Oz books were written. The circus eventually became the "Ringling Bros. and Barnum & Bailey Circus" and ran for 146 years. [1]

Cite error: <ref> tags exist, but no <references/> tag was found