Alan Niven, a former manager of Guns N’ Roses during what his lawyers term “their most prolific period” in the 1980s and early ‘90s, has sued his former business associates in Arizona over their attempts to stop the publication of his memoir, Sound N’ Fury: Rock N’ Roll Stories . In the suit, filed yesterday and obtained by Variety , Niven’s lawyers argue that the confidentiality agreement they signed in 1991 was repeatedly breached by three principal members of Guns N’ Roses – singer Axl Rose,