giving lectures in Brazil, Japan, Canada, and the United States over the next 14 years. In 1970 and 1972, Foucault served as a professor in the French Department of the University at Buffalo in Buffalo, New York. In May 1971, Foucault co-founded the Groupe d'Information sur les Prisons (GIP) along with historian Pierre Vidal-Naquet and journalist Jean-Marie Domenach. The GIP aimed to investigate and expose poor conditions in prisons and give prisoners and ex-prisoners a voice in French society. It was highly critical of the penal system, believing that it converted petty criminals into hardened delinquents. The GIP gave press conferences and staged protests surrounding the events of the Toul prison riot in December 1971, alongside other prison riots that it sparked off; in doing so it faced a police crackdown and repeated arrests. The group became active across France, with 2,000 to 3,000, members, but disbanded before 1974. Also campaigning against the death penalty, Foucault co-authored a short book on the case of the convicted murderer Pierre Rivière. After his research into the penal system, Foucault published Surveiller et punir: Naissance de la prison (Discipline and Punish: The Birth of the Prison) in 1975, offering a history of the system in western Europe. In it, Foucault examines the penal evolution away from corporal and capital punishment to the penitentiary system that began in Europe and the United States around the end of the 18th century. Biographer Didier Eribon described it as "perhaps the finest" of Foucault's works, and it was well received. Foucault was also active in anti-racist campaigns; in November 1971, he was a leading figure in protests following the perceived racist killing of Arab migrant Djellali Ben Ali. In this he worked alongside his old rival Sartre, the journalist Claude Mauriac, and one of his literary heroes, Jean Genet. This campaign was formalised as the Committee for the Defence of the Rights of Immigrants, but there was tension at their meetings as Foucault opposed the anti-Israeli sentiment of many Arab workers and Maoist activists. At a December 1972 protest against the police killing of Algerian worker Mohammad Diab, both Foucault and Genet were arrested, resulting in widespread publicity. Foucault was also involved in founding the Agence de Press-Libération (APL), a group of leftist journalists who intended to cover news stories neglected by the mainstream press. In 1973, they established the daily newspaper Libération, and Foucault suggested that