Reign of Terror happened in 1793 after the Radical took control over the leadership positions within the French Revolution. This radicals were led by a man named Maximilien de Robespierre
During this time a lot of people within the French Revolutionaries group believed that the monarch has sent its people to inlingtrate the group. As a result, many of them started to threw around accusations, They arrested the people who they believed to be disloyal to the revolutionary cause even without hard evidence.
As a result, around 40,000 were massacred under Robespierre's leadership. The reign of terror lasted until they removed Robespierre from power on July 1794.
