They won’t come out and admit they’re stalinists but by attacking McCarthy, defending Hiss, talking about “blacklisting”, getting nostalgic about the “good fight” a la the movie “The Way We Were” etc. etc. - they might as well go ahead and admit it - because their actions belie their words as you point out.
LOL...since my break from the brainwashing of the left, I have the complete opposite tack:
Defend McCarthy, Attack Hiss, pooh-pooh blacklisting, ridicule the good fight PARTICULARLY “The Way We Were” and so on.
I’m with ya!