...The embarrassing similarities between Hitler's National Socialism and Stalin's brand of Communism...
The blind pig snuffles up an acorn.
Similar because they are the same.
Ayn's description is perfectly apt.
Whether Communists, Fascists, Progressives or whatever, they are all socialist looters, and their useful idiots, moochers.
What Chambers was saying is that naked materialism was the common denominator.
For the world, as seen in materialist view from the Right, scarcely differs from the same world seen in materialist view from the Left. The question becomes chiefly: who is to run that world in whose interests, or perhaps, at best, who can run it more efficiently?
If you accept a world with no God but materialism, as Rand did, you operate on the same premise as Marx, even if you diametrically oppose all of his solutions to the human condition.
Chambers is calling the materialistic premise wrong and therefor Marx AND Rand wrong.
I happen to agree with him.