Michael Kazin? Wasn't he very briefly attracted to Weatherman in '69?
Jeffrey Herf from his speech at the Horowitz/Collier Second Thoughts Conference in D.C. in the mid-80's and the reactions to his Telos articles defending the placement of the Euromissiles to counter the SS-20's, isn't as hard to figure out. Martin J. Sklar, who wrote brilliant essays on corporate liberalism for Studies on the Left and a seminal piece in Radical America in '70 on, "disaccumulationist capitalism" has for some time been on the advisory council of SDUSA as was William J. Wilson once. Former editorial bd. member of Socialist Revolution/Review, Louis Menashe, too is in or close to SDUSA.