***Is it not apostasy to disagree with a Mormon prophet? ***
“No, it is not.”
If it’s not why were the Morrisite mormons massacred on Brigham Young’s orders, ,and Gladdenite Mormons persecuted in 1862.
Ancient history but when you stir old manure it still stinks.
Morris imprisoned those who wanted to leave his fold and government forces took action against him for it. He resisted and was killed in the standoff and battle that resulted. A more detailed account is at
http://www.signaturebookslibrary.org/EstZion/zionch17.htm
Gladden was excommunicated and he and his followers were publicly denounced. I don’t know of any violence done to them.