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The Seven Warlords of the Sea, or simply the Seven Warlords, were a selection of seven incredibly powerful and notorious pirates allied to the World Government. Collectively, they constituted one of the Three Great Powers that kept the world in balance.
After two members (Crocodile and Donquixote Doflamingo) had their titles revoked after their heinous crimes became public, Marine Admiral Fujitora led a campaign to abolish the Seven Warlords system. He achieved this goal during the most recent Levely, as the council of rulers voted to abolish the system; the five remaining Warlords at the time immediately had their bounties unfrozen and became enemies of the World Government once again. Additionally, the World Government intended for the SSG's Seraphim to replace the Warlords.
The Seven Warlords of the Sea are a major group in One Piece's overall story, with most of its individual members having encounters with the Straw Hat Pirates at different points of their adventure, either as primary antagonists or as important allies.
The Seven Warlords of the Sea were seven extremely powerful pirates who entered into the service of the World Government. The purpose of the Seven Warlords was to have the pirates deal with other pirates. They were also a great symbol of the government's strength. In return for their alliance with the World Government, every member's bounty was frozen, and they had significantly more leeway to commit crimes.
Although they worked for the World Government, the Seven Warlords themselves typically did not care about nor respect the Government (excluding Bartholomew Kuma, who was later modified into their puppet) or even the other Warlords and were often considered by the Marines to be no different from any other pirate. On the other hand, they were known at large as "government dogs" and despised by other pirates, yet were still feared and respected for their infamous reputation and strength they had acquired before and during their Warlord tenure.
The Seven Warlords seemed to be a balance between the chaotic Four Emperors and the orderly Marines. The majority of the Warlords were composed of New World veterans, those who have met the Emperors or even fought against them.
Of the eleven pirates to hold the title of Warlord, only seven were captains of their respective pirate crews. Crocodile was secretly the leader of the criminal organization Baroque Works, while the remaining three (Mihawk, Kuma, and Weevil) had no crews during their tenure. Also, all but three of them (Mihawk, Jinbe, and Weevil) are Devil Fruit users.