It's probably more helpful to study the actual policies of communist countries.
And sure, at greater length than "they starved people to death and persecuted Christians", surveying a fairly broad range of regimes as opposed to just the worst ones like the Khmer Rouge or the USSR at its absolute worst moments. But my point is, if you have lofty Marxist theories that something like two dozen dedicated Marxist states with zero internal opposition never attempted to put into practice, there's little use describing Marxism as being the sum of said theorizing. Political religions, like theological ones, are the sum of what their followers make of such. You could just as well try to boil down "Protestantism" in its entirety to the tracts and manifestos of Calvin and Zwingli, or the confessions produced by 16th and 17th century state churches, as opposed to the lived religion of a billion worshipers around the world today, who are members of diverse denominations and who by and large have never read such.
This is what de Carvalho said though. He explicitly included Bukovsky and Solzhenitsyn in his reading list. He included Voegelin, whom I've read and who looks at communism through a critical lens. He also recommended reading 'good books on the history of communist regimes written from a non-apologetic point of view.' His point was that you had to understand the theory, the application, and the results to fully understand the phenomenon of communism, but that virtually no one on the right or the left had done this. They were just arguing with one another in the sense that fencers fight one another - by rehearsing rote arguments and counterarguments which had become divorced from realities, from the principles that actually informed what they were essentially miming.