Root


 * Name: also known as ANBU: Root Division.
 * Affiliation: ANBU, Konohagakure
 * Leader: Formerly Danzo
 * Members: None. Formerly Sai and other unknown secret Ninja
 * Status: Disbanded

is an ANBU training department that was founded by Danzo. This is an extremely strict group. Danzo trains members to lose their emotions. Each member has a codename and never reveal their true name. Sai's actual name is unknown thus being Codename: Sai. They are later on sent on secret missions that are never revealed what they are.

Infiltrating Orochimaru's Hideout

 * Assigned to: Sai
 * Rank: A-Rank (could be S-Rank)

Secret Purpose: The apparent purpose of this mission was so that Danzo would be able to get information and ally with Orochimaru so they could destroy Konoha for revenge. However, it was later revealed that the real purpose was something else. After Team 7 looked into Sai's bingo book, they found several people who must be killed (or been killed), for being a threat against Konoha. Since Sasuke was one of them, Yamato deducted that the alliance was just a trick to get near Sasuke and kill him, which is later confirmed by Sai himself.