This was published in 1976. Richard Wurmbrand, the author, was a Romanian prisoner of conscience under both the Nazis and the Communists and the founder of Voice of the Martyrs.
It's not clear whether this is the same text as his "Marx and Satan," published in 1986.
“It’s not clear whether this is the same text as his “Marx and Satan,” published in 1986.”
“Marx and Satan” is an excellent book. I recommend it highly.