I was active in the early days of the antiwar movement in Cambridge, Mass. The influence of the CP was powerful. They edited all publications, provided all needed money, and directed every step of the movement. They worked with leadership and ran a very tight ship. I could not get any article published in the movement organs without CP deep editing. The Marxist influence was powerful right from the beginning. Even then many did not see it or understand. I left the movement almost as soon as I entered it because of the control exerted by the Communists.
I totally believe and agree with this. I think some of these points have been made by Horowitz in many of his writings as well. Communist disinformation is with us to this very day in much or our political vocabulary and many of the commonly espoused views.