This is a 1980 case.
US Federal Courts can try non Americans for tortious acts committed outside the United States
The Filartiga’s son was kidnapped and tortured to death by the head of the Paraguyan police in Paraguya. The family saw the body.
Pena Irala was the police chief.
Filartiga and Pena Irala both came to the US separately.
Pena Irala stayed illegally and was then held in Navy Yard pending deportation
Filartiga filed a wrongful death suit against him. The court ruled it could be heard
A torturer is hostis humani generis. The case could proceed since both parties were in the United States. The plaintiff one and was awarded over $10 m