The Church of Jesus Christ of Latter-day Saints discontinued the practice of polygamy in 1890 and has absolutely no affiliation with a polygamous group in Texas calling itself the “Fundamentalist Church of Jesus Christ of Latter Day Saints”.
In 1998, Church President Gordon B. Hinckley said: "I wish to state categorically that this Church has nothing whatever to do with those practicing polygamy. They are not members of this Church. Most of them have never been members...”
"If any of our members are found to be practicing plural marriage, they are excommunicated, the most serious penalty the Church can impose. Not only are those so involved in direct violation of the civil law, they are in violation of the law of this Church."
There Is No Such Thing as a "Mormon Fundamentalist" or "Mormon Sect"
The term "Mormon" is a nickname commonly applied to members of The Church of Jesus Christ of Latter-day Saints. There is no such thing as a "Mormon fundamentalist," nor are there “Mormon sects." A correct term to describe these polygamist groups is "polygamist groups." The inclusion of the word "Mormon" is misleading and inaccurate.
The Associated Press Stylebook states, "The term Mormon is not properly applied to the other Latter Day Saints churches that resulted from the split after [Joseph] Smith's death."