Argentinean-born dermatologist, Cuban revolutionary Ernesto "Che" Guevara [1928-1967]. Che was indeed charismatic, brave and idealistic, but his ideals were disastrous. When Che is captured by Bolivian authorities he has the temerity to accuse Bolivia of being a "military dictatorship," which is of course exactly what he had helped establish in Cuba.
[Hat Tip Peter Foster]
