The Reign of Terror in the French Revolution laid the foundations from which communism grew. It pushed for an idea of “liberation” that gradually destroyed free will, and was based on a top-down system that sought to establish social good by regulating the beliefs and opinions of the individual.
Communism sustains itself by violently suppressing all other ideas. Its dictators hold that their ideas are Utopian—the end of human progress—and that all ideas contrary to their own should be crushed by force.