He maintained a hard line against student protesters throughout 1968 . Clashes between the government and protesters culminated in the Tlatelolco massacre in October 1968 , a few days before the 1968 Summer Olympics were held in Mexico City . In a separate incident , he ordered the transfer of 15 % of the Mexican military to the state of Guerrero to counter guerrilla groups that were operating there
Tlatelolco massacre
Tlatelolco massacre
Luis Echeverría