Fraternal correction
Fraternal correction (correctio fraterna) is a Christian social practice in which a private individual confronts a peer directly, and ordinarily privately, about a perceived wrongdoing, as opposed to an official discipline passed down by a superior. In Roman Catholic ethics, fraternal correction is sometimes obligatory on pain of mortal sin, though not in the case of someone who offends through invincible ignorance. External links

Catholic Encyclopedia "Fraternal correction"
 

Christian ethics