D&C 42

When it comes to Church discipline, the Lord makes it clear -

"...if thy brother or sister offend thee, thou shalt take him or her between him or her and thee alone; and if he or she confess thou shalt be reconciled.
89 And if he or she confess not thou shalt deliver him or her up unto the church, not to the members, but to the elders.  And it shall be done in a meeting, and that not before the world."  (Doctrine and Covenants | Section 42:88 - 89)

And -

"If any shall offend in secret, he or she shall be rebuked in secret, that he or she may have opportunity to confess in secret to him or her whom he or she has offended, and to God, that the church may not speak reproachfully of him or her."  (Doctrine and Covenants | Section 42:92)

Obviously, discipline and repentance is personal and not to be shared.  But -

"...if thy brother or sister offend many, he or she shall be chastened before many.
91 And if any one offend openly, he or she shall be rebuked openly, that he or she may be ashamed.  And if he or she confess not, he or she shall be delivered up unto the law of God."  (Doctrine and Covenants | Section 42:90 - 91)

If one is boastful, apostate, teaching false doctrine, etc. amongst many, it becomes necessary to that the discipline is shared with the many.