Italy's Mani Pulite (1992-1994)
Milan prosecutors investigating a minor bribery case uncovered a system of kickbacks across Italian politics and business. The probe, known as Clean Hands, reached senior figures in the Christian Democrats and Socialists and helped collapse the parties that had governed Italy since World War II.
Dozens of politicians and executives were arrested; the First Republic's governing parties disintegrated.
The investigation's aggressive tactics and political use became a cautionary tale about prosecutorial overreach, even as it reshaped Italian politics.
Hungary's post-Orbán cleanup faces the same tension: a sweeping probe can reset a political system, but its methods and motives will be contested for years.
