Exclusive: Viacom should give vote to all investors, end non-voting class - CalSTRS official

BOSTON (Reuters) - An official for the second-largest U.S. public pension system on Thursday called on Viacom Inc to do away with its dual-class share structure, the latest call from an investor for change at the media empire controlled by the aging mogul Sumner Redstone as doubts grow over his ability to lead.