The Constitution doesn't prevent a US government from adopting communist policies...
The subject is the commerce clause specifically, hence note that the commerce clause was constructed with the recent experiences of under both British imperial rule and that of the Articles of Confederation. "Regulation" of "commerce" was predicated on the understanding of what national regulation of commerce meant in that era. To that end, trade and similar activity between states, and their spillovers, were typically understood as one of regulating private enterprise and the spill-over trade (and other disputed issues) between the states.
To be sure, any typical regulatory power of a state in that era, including that of protecting industries and cartels, was presumably also granted the national government as well. The abandonment of mercantilism and hegemony of classical liberalism was not yet complete, so one shouldn't presume that free trade and no tariffs was the sole regulatory purpose in the commerce clause (which is why tariffs on foreign goods were often still thought of as common sense).
However, within the traditional presumptions of power the authority of Congress was limited by the clause. When, for example, purely local commerce within any given state was in direct competition with interstate activity, the inability of the federal government under Gibbons v. Ogden to reach control that commerce allowed for state control of its internal commerce.
Of course, as we all should know, the commerce clause took on a life of its own, providing a springboard of expansion of the federal government power far greater than the minimal state envisioned by the founders. Through a series of court rulings, sophistry at best and outright fraud at worst, "read into" the clause all sorts of federal powers that never existed.
One of the first major transgressions by the federal government was the railroad Shreveport rate case. In state Texas freight rates were LOWER than that charged by interstate rail lines (whose rates were regulated by the federal government). The "wise" federal government found such rate cutting harmful and "unfair" and so the courts found that local competition can be suppressed insofar as it was necessary to preserve the desired rate structure for the interstate traffic.
And hence began this moronic "re-reading" of the commerce clause to allow all sorts of federal power - including supporting monopoly power on commerce for the "good" of society.