J. Rubin, J. Lennon, and A. Hoffman are dead. As for designated wired in "protest pens." Not a chance with Rubin and Hoffman. I could see them under the cover of darkness sneaking donkeys into protest pens at a Democratic convention, but you would never see Rubin or Hoffman quietly protesting from inside a pen.
The current anti-war movement has nothing close to these two. If they protested the Afghan, Iraq, Pakistan etc incursions, people would know. As for them being Marxist, I think they were sincerely anti-war, but from there they were hustlers that would say and do anything to gain attention to themselves to make money.