Missing-nin

Missing-nin, also known as Rogue Ninja, is a ninja who left his village, and often dishonored the symbol of the former country, usually by making a scar over his forehead protector. They´re often pursued by the country, mostly in the shape of a Hunter-nin, or by the police force. The job of a Hunter-nin is to eliminate missing-nin so that village secrets would not be leaked to other villages, even if the proposed missing-nin is dead.

The ninja organization Akatsuki is composed of nine (originally ten) S-class missing-nin.

List of Missing-nin
Zabuza's group:
 * Zabuza Momochi
 * Haku
 * Demon Brothers

Orochimaru's Sound Ninja:
 * Orochimaru
 * Kabuto Yakushi
 * Sasuke Uchiha

Members of Akatsuki:
 * Pein
 * Itachi Uchiha
 * Kisame Hoshigaki
 * Sasori
 * Deidara
 * Kakuzu
 * Hidan
 * Zetsu
 * Tobi
 * Konan

Suien's Group:
 * Suien
 * Hisame
 * Kirisame
 * Murasame

Other:
 * Aoi Rokusho
 * Gantetsu
 * Raiga Kurosuki