Taylor wasn't the target.
The original 1968 “Planet of the Apes” movie was co-written by Michael Wilson, who also wrote “A Place in the Sun,” “Bridge on the River Kwai” and “Lawrence of Arabia,” and who had been blacklisted during the 1950s, so he didn't get initial proper credit for the original “Bridge” or even “Lawrence.” Born and raised in Oklahoma, Wilson was a U.S. Marine during World War II. After HUAC declared him an unfriendly witness, he moved with his family to France. About the nicest fallback position you could imagine.
I didn't know any of this until I began reading “Hide in Plain Sight: The Hollywood Blacklistees in Film and Television, 1950-2002.” In the beginning of that book, authors Paul Buhle and Dave Wagner argue that, in “Planet,” Dr. Zaius cross-examining the chimpanzee scientists Cornelius and Zira is a kind of HUAC moment. Cornelius finds the ancient human civilization, Zira determines there's no physiological reason for humans to be mute, and Zaius wants these discoveries discredited. Taylor (Heston) is his excuse to do so. His target isn't Taylor, in other words, but the scientists and science generally.
“Your case was preordained,” he says to Taylor. “You made it possible for me to expose” the chimpanzees.
This is the part that really knocked me for a loop:
In Wilson's inner narrative, then, there was another warning accompanying the larger one against nuclear war contained in Serling's famous ending, when Taylor finds the ruins of the Statue of Liberty. The inner warning was addressed to the liberals of the Cold War: you may think they are after Communists, but in fact they are after you.
I'd always thought liberals like Edward G. Robinson getting entrapped and having to beg for redemption from the likes of Ward Bond, and often not finding it, was a bug of HUAC and the blacklisting system; according to this insight, it was a feature. That road, discredited though it was by the 1960s, eventually led to the “liberal Hollywood” attacks of today. The Breitbarts of the world don't need the communist cover anymore.