The Church of Jesus Christ of Latter-day Saints has posted an official statement about questions regarding discipline and excommunication:
http://www.mormonnewsroom.org/article/church-responds-to-church-discipline-questions
“Sometimes members’ actions contradict Church doctrine and lead others astray. While uncommon, some members in effect choose to take themselves out of the Church by actively teaching and publicly attempting to change doctrine to comply with their personal beliefs. This saddens leaders and fellow members. In these rare cases, local leaders have the responsibility to clarify false teachings and prevent other members from being misled. Decisions are made by local leaders and not directed or coordinated by Church headquarters.”