About the film
El grito is a 1968 Mexican documentary film directed by Leobardo López Aretche about the Mexican Student Movement of 1968, in which university students rallied public support for political change under the Institutional Revolutionary Party (PRI), which had been in power since 1929. The film also chronicles the Tlatelolco massacre that occurred in Tlatelolco, Mexico City, on 2 October 1968, committed by the Mexican Armed Forces against students of the National Autonomous University of Mexico (UNAM), the National Polytechnic Institute (IPN) and other universities.
From the film's Wikipedia article (CC BY-SA 4.0).