Notice how Sen. Warren equates "making a profit" with "exploiting consumers." Under communism, free market principles are not allowed to exist, and no business entity is allowed to earn a profit. The government determines all prices at both the retail and wholesale levels, and companies exist only to serve the power base of the government itself rather than consumers. Under such systems rooted in communism, food scarcity sharply increases while product quality and variety both suffer a devastating plunge. When governments set food prices artificially low, they inevitably create scarcity (empty shelves) which must be alleviated by forcing rationing on the population. This rationing, in turn, is enforced at gunpoint by government goons who arrest "food smugglers" or people who are buying and selling food outside the controlled government system. This would rapidly expand to include farmers' markets and CSA organizations across America (Community Supported Agriculture), which bring quality farm-fresh food to American homes, bypassing central food distributors and retailers.
Unfamiliar with the term HOLODOMOR, I had to look it up. This is the link to one of the explanations.