May 5 marks the bicentennial of Karl Marx, who set the stage with his philosophy for the greatest ideological massacres in history. Or did he?

He did, but deniers still remain. “Only a fool could hold Marx responsible for the Gulag,” writes Francis Wheen in “Karl Marx: A Life” (1999). Stalin, Mao and Kim Il Sung, Mr. Wheen insists, created “bastard creeds,” “wrenched out of context” from Marx’s writings.

Marx...