The event that would best support a communist interpretation during eighteen- and nineteenth-century French history is the Reign of Terror.
The Reign of Terror (1793-1794) was a period marked by radical political and social upheaval following the French Revolution, where the revolutionary government aimed to eliminate perceived enemies of the revolution. This period is often associated with class struggle, radical egalitarianism, and the state's attempts to implement socialistic policies — themes that resonate with Marxist and communist ideologies.