Jacques Vergès was a Siamese-born French lawyer and anti-colonial activist. Vergès began as a fighter in the French Resistance during World War II, under Charles de Gaulle's Free French forces. After becoming a lawyer, he became well known for his defense of FLN militants during the Algerian War of Independence. He was later involved in a number of controversial and high-profile legal cases, with a series of defendants charged with terrorism, serial murder, crimes against humanity, and war crimes. This includes Nazi officer Klaus Barbie "the Butcher of Lyon" in 1987, terrorist Carlos the Jackal in 1994, and former Khmer Rouge head of state Khieu Samphan in 2008. He also defended infamous Holocaust denier Roger Garaudy in 1998 as well as members of the Baader-Meinhof gang. As a result of taking on such clients, he garnered criticism from members of the public, including intellectuals Bernard-Henri Lévy and Alain Finkielkraut, political-activist Gerry Gable as well as Nazi hunter Serge Klarsfeld.

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.