Frankly, it's a labeling issue and I've never understood why communism appears on the left, right alongside anarchy (which is pretty much a polar opposite). Communism has always been considered a far-left ideology but in practice communist dictatorships have basically been identical to far-right dictatorships like Germany and Italy, as well as theocracies, in that they're all characterized by a highly centralized authority and suppression of individual rights. Going by Wiki, leftism is defined by concepts such as "equality, fraternity, rights, progress, reform, and internationalism," while right-wing ideologies are defined by "authority, hierarchy, order, duty, tradition, reaction and nationalism." Communist regimes clearly resemble the latter.
When Marx describes the 3 phases of communism, in phase 2 "A dictator or elite leader (or leaders) must gain absolute control over the proletariat. During this phase, the new government exerts absolute control over the common citizen's personal choices -- including his or her education, religion, employment and even marriage. Collectivization of property and wealth must also take place."
Then in phase 3, all non-communists are eradicated, wealth is magically redistributed to the people, and everyone sings kumbaya. But this has been proven to be practically impossible for obvious reasons and as such communist dictatorships just stop at step 2, in which they resemble their far-right counterparts. Communism was never even meant to be practically implemented in full, it was just used as a selling point by aspiring dictators to rally the working class and win power. So I get that ideologically it differs from the far-right, I just don't think it makes sense to label an ideology that's blatantly flawed and likely even intentionally misleading based on what it's "supposed to be."