The Enemy Is the Engine: Why Populist Movements Cannot Survive Their Own Victories

In 422 BCE, the Athenian demagogue Cleon died at the Battle of Amphipolis, and the city briefly exhaled. His opponents — the aristocratic faction he had spent years denouncing as traitors, cowards, and friends of Sparta — celebrated. The historian Thucydides, who despised Cleon with a scholar's particular contempt for a man he considered a fraud, recorded the moment with barely concealed satisfaction. What Thucydides did not dwell on, perhaps because it was too uncomfortable, was that Athens promptly produced another Cleon. And then another. The demagogos — the leader of the people — was not a personality type that Cleon had invented. It was a structural role that Athenian democracy reliably generated, because the conditions producing it had not changed.

This is the observation that the historical record presses on anyone willing to look at it honestly: the populist leader who rises by promising to fight for ordinary people against a corrupt elite is not simply a product of individual ambition or a specific political moment. He is a product of a recurring dynamic that human societies have generated across cultures, centuries, and wildly different institutional arrangements. And the enemy list — the rotating cast of villains without which the movement cannot sustain itself — is not a rhetorical excess. It is the mechanism.

Why the Enemy Cannot Be Defeated

The structural problem is straightforward once you see it, though it is easy to miss when you are inside the movement.

A populist coalition is built on the promise of a fight. The fight requires an enemy. But the political system that produced the original enemy — the elite, the establishment, the corrupt old order — is not destroyed when the populist leader achieves office. It is, at best, partially displaced. The grievances that animated the original coalition do not disappear. The structural conditions producing inequality, institutional dysfunction, or cultural anxiety persist, because they are produced by forces that no single political figure controls.

This means that the morning after the victory, the leader faces an impossible arithmetic problem. The promises made during the campaign cannot be fully delivered, because no government in history has ever fully delivered on promises made during a populist campaign. The coalition that won the election is held together not by policy agreement — populist coalitions are typically ideologically incoherent — but by shared opposition to a common enemy. When the enemy is nominally defeated, the coalition begins to fracture.

The solution, across five thousand years of political history, has been remarkably consistent: find a new enemy, or redefine the old one as more dangerous than previously understood.

Robespierre and the Arithmetic of Purity

The French Revolution's Terror is the most thoroughly analyzed example of this dynamic in the Western canon, and it repays attention precisely because it happened so fast. Robespierre was not a cynic. Contemporary accounts and his own voluminous writings suggest a man of genuine conviction, someone who believed with complete sincerity that the Revolution represented the general will of the French people and that its enemies were enemies of humanity itself.

But the Committee of Public Safety's enemy list expanded with a momentum that had almost nothing to do with the actual threat environment. Aristocrats were the first enemies. Then moderates who objected to the pace of executions. Then the Girondins. Then Danton, who had been one of the Revolution's architects. Then, in the final weeks before Thermidor, anyone whose loyalty could not be verified in the moment. The expansion was not arbitrary sadism. It followed a logic: the Revolution had not yet achieved its goals, which meant enemies were still operating, which meant the circle of the trustworthy had to keep contracting.

The logic is the same logic that drove Stalin's purges, Mao's Cultural Revolution, and every other instance in the historical record where a movement built on permanent opposition found itself in power. The enemy is not a problem to be solved. The enemy is the solution to the problem of maintaining movement cohesion.

Huey Long and the American Variant

The American version of this dynamic tends to be less lethal and more durable, which makes it in some ways more instructive. Huey Long, the Louisiana governor and senator who dominated his state's politics in the 1920s and 1930s, built a genuine mass movement on a platform of redistribution and anti-elite populism that had real material content — his Share Our Wealth program proposed policies that were, by the standards of his era, substantively radical.

But Long's political operation also required a continuous supply of enemies: Standard Oil, the Old Regular machine in New Orleans, the Baton Rouge newspapers, the Roosevelt administration once it became a rival rather than an ally. Each enemy served to explain why the promises had not yet been fully delivered, and each enemy's defeat or neutralization required the identification of the next. Long was assassinated in 1935 before the full trajectory of his movement could play out, but the machine he built — operated by his successors without his genuine redistributionist commitments — survived by retaining the form of the enemy-identification ritual while gradually evacuating its substantive content.

This is the other endpoint the historical record offers: the populist movement that survives the death or departure of its founder by converting the enemy list from a political instrument into a cultural one. The enemies become symbolic. The movement persists as identity rather than program.

What Resolution Looks Like

History suggests three ways the dynamic resolves. The movement finds an enemy large enough and durable enough — a foreign power, a genuine institutional crisis — to sustain cohesion indefinitely, which is rare. The movement fractures as the enemy list turns inward and begins consuming its own members, which is common. Or the movement gradually converts itself into a conventional political party, trading the enemy-identification mechanism for the slower, less emotionally satisfying work of governance, which occasionally happens but requires leaders willing to accept the loss of intensity that the conversion entails.

The United States has experienced all three resolutions at various points in its history. The progressive movement of the early twentieth century largely followed the third path. The McCarthyite movement of the 1950s followed the second. The contemporary populist formations on both the left and right are, as of this writing, still in motion.

The five thousand years of available data do not predict which path any specific movement will take. They do suggest, with considerable consistency, that the path is determined less by the leader's intentions than by the structural incentives built into the movement's founding logic. A coalition that cannot exist without an enemy will find one. That is not a political observation. It is a description of how human groups have always worked.