Thread:Omega64/@comment-4503935-20190703001710/@comment-10330822-20191225211414

It wasn't made public. The only people who seem aware of Roots existance and its activities are the upper echelon of the Five Great Nations, and presumably Amegakure.

Them knowing isn't a big surprise because the information networks of these nations are very good. Which is presumably also why the Raikage not only knew Naruto was the Nine-Tails' Jinchuriki, but that he was the son of Minato and Kushina.

The Root was a ANBU sub-division. So other members of ANBU knowing of them isn't that big of a surprise because their work probably overlapped. So Yamato and Kakashi knowing of them isn't a big surprise, even if you ignore the non-canon Kakashi ANBU stuff.