Donquixote Pirates

The Donquixote Pirates are a group led by Donquixote Doflamingo, who goes by the underworld broker alias "Joker".

Past
Not much is known about the Donquixote Pirates before the timeskip, as the term itself did not come up until after. However, Law was once a subordinate whom Doflamingo treats as a younger brother, before his defection. Vergo was a member as well, and apparently Law's senior, but before becoming famous, he enlisted in the Marines to serve as a spy on behalf of the Joker.

Crew Strength
The Donquixote Pirates is a very powerful crew, as their captain is a world famous pirate and a member of the Shichibukai with a former bounty of 340,000,000. Crew members Monet, Baby 5, and Buffalo are all known Devil Fruit users, while Vergo is a mole who has ascended the Marines ranks for about fifteen years, eventually becoming a vice admiral, while keeping his true identity hidden from everyone outside of his affiliates. The crew also once consisted of Trafalgar Law, a powerful pirate who became a Shichibukai as well with a former bounty of 440,000,000, prior him leaving for his own interests.