Stephen E. Robinson and H. Dean Garrett discuss the meaning of D&C 132:54–55.
Stephen E. Robinson and H. Dean Garrett, A Commentary on the Doctrine and Covenants: Volume 4 (Salt Lake City: Deseret Book, 2005), 259
54. Shall be destroyed. Often we use the word destroyed to mean "killed" or "to suffer death in the flesh." However, the word is also used in the scriptures to mean "removed or separated." Peter quoted Moses when he said that the Lord would raise up a prophet like unto Moses and every person who will not hear the words of that prophet will be destroyed from among the people (Acts 3:22-3). When this prophecy is discussed in the Book of Mormon, however, the warning is that the people would be cut off or removed from among the people (1 Nephi 22:20). In the Doctrine and Covenants, the term used is "cast out" (see D&C 42:75, for example). Today, the word used is excommunication.