Reign of Terror
The Reign of Terror was the time of chaos and violence that followed the execution of Louis XVI during the French Revolution, in which many people were led to the guillotine. It was mainly engineered by Maximilien Robespierre, started in 1793 and ended when Robespierre himself was guillotined in July of 1794.
The Reign of Terror played a huge role in the formation of Communism, directly inspiring its founder, Karl Marx, in planning it. In correspondences with Frederick Engels, he stated regarding how Communism was to be implemented: “There is only one way of shortening, simplifying, and concentrating the bloodthirsty death-throes of the old society and the bloody birth pangs of the new--revolutionary terror. . . . [...] Once we are at the helm, we shall be obliged to reenact the year 1793. [...] We are pitiless and we ask no pity from you. When our time comes, we shall not conceal terrorism with hypocritical phrases. . . The vengeance of the people will break forth with such ferocity that not even the year 1793 enables us to envisage it. . . .”