Donquixote Doflamingo, alias Joker, became a dominant Underworld broker by forming strategic partnerships and exerting control over powerful subordinates. His main business partner was Kaidou of the Beasts, one of the Four Emperors. His authority extended over the
Donquixote Pirates, Dressrosa, and Caesar Clown. Doflamingo also infiltrated the Marines with Vergo as a spy and held influence in the World Government. His Underworld dealings included trading in illegal commodities like SMILEs, slaves, high-value goods, and weapons of mass destruction.