M. Russell Ballard disavows Mormon fundamentalist groups.
M. Russell Ballard, "The Importance of a Name," General Conference, October 2011
Our members have been called Mormons because we believe in the Book of Mormon: Another Testament of Jesus Christ. Others may try to use the word Mormon more broadly to include and refer to those who have left the Church and formed various splinter groups. Such use only leads to confusion. We are grateful for the efforts of the media to refrain from using the word Mormon in a way that may cause the public to confuse the Church with polygamists or other fundamentalist groups. Let me state clearly that no polygamist group, including those calling themselves fundamentalist Mormons or other derivatives of our name, has any affiliation whatsoever with The Church of Jesus Christ of Latter-day Saints.