Funny... I don't remember hearing about that in Ken Burns exhaustive historical documentary about Vietnam?
Seriously, I can still see Cronkite's visage on TV solemnly intoning, "The only way out of this war is a negotiated settlement!", even as SVA and US Marines were kicking NVA butt up and down the coast (this was during the first Tet offensive).
Of course, it was a different world back then, when we trusted everybody with everything. We were, of course, aware of the Red Menace, but nobody really thought they'd infiltrated anything of note, let alone a major TV network.
Back in the early 60's, when I was real young lad (!), I remember I'd watch "Eyewitness To History" on CBS, telecast every Friday night, at 10:00 PM, EST, with my parents.
This show had a decidedly leftist bent, although I had no comprehension of what that really meant, or it's implications.
As an example, they ran one episode (they may have run more that I wasn't familiar with/hadn't seen) touting the new emerging African states that were ripe with ferment, featuring such august names as Kwame Nkrumah, Moise Tshombe, Joseph Kasavubu, and Patrice Lamumba.
The entire show they were extolling all the great possibilities for these countries if only these guys could hold sway and ascend to power.
No mention was ever made of Communism or socialism, or what would probably happen to those countries if they did get power.
No mention was ever made of just what a dark side these guys, and others like him, had. They may have labeled them as innocent agrarian reformers, but frankly, if they did, it escapes me some 55 years later.
At the time I did not know, or really care, about the nascent culture wars, but I learned soon enough.
It's still amazing - this shit, staring people right in the face, flaunting this dangerous and pernicious ideology for decades - and people still don't see it.
None so blind as those who will not see.
CA....