Corcyra’s revolution in 427 BC, the fifth year of the Peloponnesian War, is a paradigm of revolutionary logic. Thucydides tells us that the citizens’ divisions had been of the garden-variety economic kind. Its Assembly had taken an ordinary vote on an ordinary measure. But the vote’s losers, refusing to accept political defeat, brought criminal charges against their opponents’ leader. By thus criminalizing differences over public policy, by using political power to hurt their opponents, they gave the revolutionary spiral its first turn. The spiral might have stopped when the accused was acquitted. But, he, instead of letting bygones be bygones, convinced the assembly to fine those who had brought the charges. After all, they had to be taught not to do such things again. The assembly approved the fine. But the second use of political power to hurt opponents gave the revolutionary spiral its second turn. Had the original wrongdoers paid up, the problem might have ended right there. Instead, outraged, they gave it the third push, bursting into the Assembly and murdering him. That ended all private haven from political strife. Civil war spiraled into mutual destruction, until the city was well-nigh depopulated.