Nikolaus Barbie was a German officer of the SS and SD who worked in Vichy France during World War II. He became known as the "Butcher of Lyon" for having personally tortured prisoners—primarily Jews and members of the French Resistance—as the head of the Gestapo in Lyon. After the war, United States intelligence services employed him for his anti-communist efforts and aided his escape to Bolivia, where he advised the dictatorial regime on how to repress opposition through torture. In 1983, the United States apologised to France for the U.S. Counterintelligence Corps helping him escape to Bolivia, aiding Barbie's escape from an outstanding arrest warrant.

Lyon, formerly spelled in English as Lyons, is the third-largest city of France. It is located at the confluence of the rivers Rhône and Saône, to the northwest of the French Alps, 391 km (243 mi) southeast of Paris, 278 km (173 mi) north of Marseille, 113 km (70 mi) southwest of Geneva, 58 km (36 mi) northeast of Saint-Étienne.