In 3 Nephi 3:9 we find the following:
And behold, I am Giddianhi; and I am the governor of this the secret society of Gadianton; which society and the works thereof I know to be good; and they are of ancient date and they have been handed down unto us.
According to Amy Hardison, covenants were written with a specific vocabulary. Inside the covenant context, certain words had official and legal meanings that sometimes differed from their normal, everyday use. For instance, to "know" means to be loyal to and to recognize the legitimate suzerain or lord with whom the covenant is being made, and to acknowledge the terms of a covenant as binding. To do good is to keep one's covenants. [Amy Blake Hardison, "Being a Covenant People," in Covenants Prophecies and Hymns of the Old Testament, p. 24]
Note* What the reader should understand is that in using this word, Giddianhi is giving us a cultural clue that he has covenanted with Satan and his servants, he acknowledges Satan as his lord, and thus we know that Giddianhi's knowledge comes from the same source. In saying that the works are "good" Giddianhi also acknowledges that he has kept his covenants with the Devil. [Alan C. Miner, Personal Notes]