That would be Suigetsu, he never became a member though. Here's what Wikipedia says.
"Sometime before being introduced, Suigetsu trained to be one of Kirigakure's Seven Swordsmen of the Mist, an organization of particularly violent swordsmen. Having been unable to become a member himself, Suigetsu has begun collecting all of the swords of the Seven Swordsmen for himself.  He retrieves Zabuza Momochi's giant Kubikiri Hōchō soon after joining Snake, and hopes to be able to take Kisame Hoshigaki's Samehada by working with Sasuke."
And according to some of the anime eps Raiga was one of the seven swordsman.