Hold up, did I just start a discussion on the nature of the fucking universe because I got a little bit too zesty with exaggerations at 3 AM?
Well let's get back to the 100% accurate basics of communism: What's the easiest way to commit mass murder without any motive?
Think of the Sovietesque way, and adapt.
Convince the populace that measures must be taken against these who are stopping progress, and later justify the mass murder measures by pointing out the criminal and regressive nature of these people, aswell as by showing the populace how much 'progress' has been made to the people, through helpful, 100% undoubtedly 'realistic' and convenient propaganda, comparing such 'progress' to that done by other countries and even superpowers all over the world, which the populace has already been brainwashed to believe are in worse conditions.
And of course, you do all that by manipulating the populace's general thought through media and the mass murdering itself within your country. Beware of the spectre of free internet haunting your communist dreams, though, as they can entirely foil your plans. To know more on how to solve the particular issue of international media, check the example of nowadays North Korea. You'll learn how to isolate your people from the influence of such media from the
pit of hell heavenly Democratic People's Republic of Korea.
(In all seriousness, you don't know how much I wish Kim Jong Un to take a missile to his face, aswell as his entire government. Not only is one of the most disgusting dictators, he also threatens the rest of the world with potentially World War III starting weaponry continuously. Worse even to think China could potentially back North Korea up, along with any other place China has a big influence on. I can easily imagine two alliances forming.)