Helaman Ch6

The tables have turned and the Lamanites are more righteous than the Nephites. There is a time that both people are prosperous because of the peace between them as they preach the work of God. Underneath the peacefulness is the plans of Lucifer who guides the Gadianton robbers to murder and take over the Nephite government.
During the start of the 63rd year, there are more Lamanites that are righteous than there are Nephites because the Nephites are impenitent and reject the word while the Lamanites were being converted and fellowshipping one another (v1-3). The Lamanites bore their conversion testimonies to the Nephites in an effort to convince them to humble themselves, and others traveled northward to preach to the people there (v4-6). At this time there were no wars between the Lamanites and Nephites, instead they traded and mingled becoming rich from some of the newly found materials in the explored lands (v7-11).
Both nations worked together and flourished in numbers and riches through the 66th year when Cezoram, the chief judge, was murdered by an unknown hand as well as his successor, his son (v12-15). The wickedness grew again in the 67th year because of the people being greedy after being blessed so abundantly by the Lord (v16-17). Many people began to get gain by murdering and stealing, they were the Gadianton robbers amongst both nations but mostly in the Lamanites (v18-19).
When the Lamanites found out about the gang of robbers and murderers, they used every means they had to destroy them, but Satan was able to stir up some of the Nephites to join their gang and unite under oaths of loyalty (v20-21). They communicated in secret with special handshakes and signals like gangs use today with clothing so they could stand up for their fellow evil brothers to break laws and get away with it (v22-23). So deep was the corruption that when someone from the Gadianton was tried they weren't judged according to the laws of the land, but the laws set up through Gadianton and Kishkumen by Lucifer (v24-25).
This isn't the first time this kind of thing has happened, there was the first occurrence with Cain and Abel, the people that built the tower of Babel, and now again with these Gadianton robbers (v26-29). These authors of evil did not come up with their wicked ways alone, they were inspired by the author of all sin, and given the works of darkness after getting hold of the hearts of men (v30-31). Once touched by iniquity, they turned away from righteousness and were selfish, only desiring to better their riches, much to the distress of the righteous (v32-33).
That band of evil was growing among the Nephites in the 67th and 68th year, while the Lamanites grew in righteousness and strength through the spirit of the Lord (v34-36). The Lord happily started to pour blessing to the Lamanites and encouraged their hunt to destroy the Gadiantons among them (v37). While they were exiled from the Lamanites, they grew among the Nephites and gained control in their government, and started to encourage wickedness and ignore the poor and church members (v38-39). This wickedness means they are rip for destruction ready to be smitten by the hand of God (v40-41).