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Joel's brother, Ervil LeBarón, was the second-in-command until they fell out over the direction of the church.

An unhinged and dangerous cult leader who had 13 wives and scores of children, Ervil then split and created a separate sect.

In 1972, he ordered his brother's murder and it is believed Ervil's followers killed dozens of others on his command, including one of his wives and two of his children.

Yet the victims of the massacre in Sonora had nothing to do with Ervil's church.

"It's not like they can uproot an entire community," says Anna LeBaron, Ervil's daughter, who wrote a book about life in her father's sect called The Polygamist's Daughter.