Grande Blu

Grande Blu (ビッグブルー;Bigguburū)is a Legal Guild located in the free city of Port Menfi. It is mainly composed by Bounty Hunters, and often acts as a patrol for the government to get rid of the most dangerous pirates.

Trivia
Grande Blu is the Italian for Deep Blue. Not coincidentally, it's the same name given in Italy to the Grand Line in One Piece.