Underworld



The Underworld (闇) is the whole system of connections, smuggling and actions which eludes the World Government's control. It's mainly set in the New World.

Organization
According to Law, the New World is divided into territories governed by the strongest pirates thanks to their brokers, pretty similar to a huge crime syndicate. The most influential man in this world is codenamed "Joker".

Smuggling
One of the main scopes where the Underworld acts is the smuggling of illegal goods via brokers.

Past
In the last ten years, Donquixote Doflamingo built up his status as the most influential man in the Underworld under his alias of Joker. Due to this, in the last four years, he offered Caesar Clown his protection from World Government.

The Franky Family often sold the products of ships dismantling in the black market.

Baroque Works Saga
Crocodile claims to have obtained the Dance Powder via smuggling. This will cause the Alubarna's civil war. When the World Government discovered it, it deprived Crocodile of his Shichibukai status and jailed him in Impel Down's Level 6.

CP9 Saga
Franky claims to have bought the rare Adam Wood in the St. Poplar's black market.

Whitebeard War Saga
Before reaching the Sabaody Archipelago, the Straw Hat Pirates defeated Duval's Flying Fish Riders, one of the best kidnapping group and slaves supplier of Disco's Human Auctioning House.

During the Straw Hat Pirates' visit to the Sabaody Park the Hound Pets captured Keimi and sold her to Disco. This causes Luffy's rage, his attack to the Auctioning House and the whole Roswald's Incident. Due to this, Doflamingo forsakes Disco and gives him the entire House.

During the Timeskip
Due to Doflamingo's abandonment and the ruckus caused by Luffy, the Human Auction fails.

Trivia

 * Both Donquixote Doflamingo and Smoker indicates that Kuzan may have dealings in the Underworld, though Kuzan neither confirms or denies this.