The movement was permanently repressed by the government and finally tried to annihilate on the Tlatelolco massacre on October 2 , 1968 . The massacre was planned and executed under the code name Operation Galeana , by the paramilitary group called Olimpia Battalion , the Federal Security Direction ( DFS ) , then the so-called Secret Police and the Mexican Army simulating a shooting in the Plaza de las Tres Culturas after the conclusion of a concentration of the CNH . One year after , in 1969 , president Gustavo Díaz Ordaz – also a CIA 's informer assumed the responsibility of the massacre . On October 2 , 1968 , at 5 PM in the Plaza de las Tres Culturas in Tlatelolco , a neighborhood of Mexico City , almost 10 thousand men , women and children stood waiting for a meeting to start . However , when the leaders of the several student organizations and movements arrived , policemen and the military , sent by president Díaz Ordaz and commanded by Luis Echeverria , decided to dissolve the meeting . A student claims that at about 6:10 a helicopter dropped three flares over the plaza , quickly followed by the first gunshots . Students were kidnapped , tortured , and killed by the government
Tlatelolco massacre
Tlatelolco massacre
Mexican Movement of 1968