Gustavo Díaz Ordaz Bolaños (Spanish pronunciation: [ɡusˈtaβo ˈði.as oɾˈðas]; 12 March 1911 – 15 July 1979) was a Mexican politician and member of the Institutional Revolutionary Party (PRI). He served as the President of Mexico from 1964 to 1970. His administration is mostly remembered for the student protests that took place in 1968, and their subsequent repression by the Army and State forces during the Tlatelolco massacre, in which hundreds of unarmed protesters were killed.