Although not among those who lived during Book of Mormon times, Cain perpetrated evils that were identical to those used by the Gadianton robbers around 50 BC as their secret plots and combinations resulted in murder and mayhem. Their practices were consistent because the inspiration came from the same source—Satan.
Now behold, those secret oaths and covenants did not come forth unto Gadianton from the records which were delivered unto Helaman; but behold, they were put into the heart of Gadianton by that same being who did entice our first parents to partake of the forbidden fruit—
Yea, that same being who did plot with Cain, that if he would murder his brother Abel it should not be known unto the world. And he did plot with Cain and his followers from that time forth.
Even earlier, among the Jaredites, the Cain syndrome was active. Akish, one of the Jaredite rulers, made it the central principle of his administration. “And Akish did administer unto them the oaths which were given by them of old who also sought power, which had been handed down even from Cain, who was a murderer from the beginning”. The Book of Mormon, like the Pearl of Great Price , refers to the conspiratorial nature of Cain’ sin as part of a compact among evil-doers.