If we were to break out the Sodium Pentathol, the fact that liberals are statist Stalinists would exit their lips as truth.
In the real world, they will never admit it.
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.