What was the Reign of Terror, and how did it show that revolutions can lead to radical violence in the name of political ideals?

The Reign of Terror (September 5, 1793 – July 28, 1794), also known as The Terror, was a period of violence during the French Revolution incited by conflict between two rival political factions, the Girondins (moderate republicans) and the Jacobins (radical republicans), and marked by mass executions of “the enemies of the revolution.”