Alma 37:30

For behold, they murdered all the prophets of the Lord which came among them, to declare unto them concerning their iniquities; and the blood of those which they murdered, did cry unto the Lord their God, for vengeance upon those which were their murderers; and thus the judgments of God did come upon these workers of darkness and secret combinations;

They murdered all the prophets of the Lord who came among them to tell them about their sins. The blood of those they murdered cried to the Lord their God for revenge on those who were their murderers. So the judgments of God came on these workers of darkness and secret groups.

They murdered all the prophets of the Lord who came among them to warn them about their sins. The blood of those murdered prophets cried out to the Lord their God for vengeance against their killers. And so God’s judgments came upon these workers of darkness and secret combinations.