Who were the Leftists of the past who paved the way for today's progressive movement? We'll get perspective from Stephen Soukop, author of "Know Thine Enemy: A History of the Left, Vol 1." Plus: What are the links between LGBT icon Harvey Milk and the Rev. Jim Jones, who presided over the Jonestown Massacre? Dan Flynn, senior editor of the American Spectator, explains as we discuss his book, "Cult City." That and more on Friday's JANET MEFFERD TODAY.