He tried to extradite General Pinochet, ordered the arrest of Osama bin Laden, put notorious members of the Argentinian junta, such as Adolfo Scilingo, behind bars and investigated the mass executions of nearly 150,000 Spanish Republicans under General Franco. But yesterday, in the first of three cases, Spain's crusading high court judge, Baltasar Garzon, went on trial himself.
Garzon, who is viewed by many as Spain's most courageous legal watchdog and the scourge of bent politicians and drug warlords the world over, faces up to a 17-year suspension from his job in the initial case alone.
The hearing, into whether the judge abused his powers, will investigate claims he ordered illegal police recordings of conversations between suspects in a massive corruption case in Valencia, involving high-profile figures from Prime Minister Mariano Rajoy's Partido Popular Party.
Yesterday, dozens of Garzon's supporters, including Communist Party deputy Gaspar Llamazares, stood outside a packed courtroom in central Madrid and cheered the judge as he picked his way through the throngs of journalists.
"Fine, just fine," he answered, when asked how he was feeling.