Jane Fonda and Mark Lane (and maybe others). Mark Lane was in turn funded by the KGB.
http://www.paulmitchinson.com/jfk.html
Perhaps the KGB helped fund this smear-campaign against VN vets?
________________
On the lighter side, Lane quoted a "VN vet" who claimed his battalion had all raped a Vietnamese girl! HA! Even Maddonna couldn't take a session like that! 800 men? How insane!