Sergio Méndez Arceo was an advocate of the Vatican II principles , which moved for changes in ritual distribution of the sacraments , deemphasis on saints , more studying of the bible , and sociological studies to aid ecclesiastical organization . Méndez Arceo attempted unsuccessfully to have the Mexican Conference of Bishops explore the violent suppression of the student movements in 1968 , known as Mexico 68 . As an individual without the support of the other bishops , Méndez Arceo assisted the imprisoned students , often called political prisoners , following the Tlatelolco Plaza massacre . In January 1970 he informed his fellow bishops of the condition of those prisoners ; the bishops made no references to the massacre itself or the outcome , in keeping with its nonconfrontational stance toward the government at the time . Méndez Arceo was also involved in other social movements in Mexico such as striking Cuernavaca workers and guerrillas from Guerrero . The inaction by the episcopate , against what was viewed as rampant social repression , is believed to be what sparked many individual clergy and Jesuits , and the episcopate 's social secretariat , to shift its emphasis from schools for the elite to social action programs
Tlatelolco Plaza massacre
Tlatelolco massacre
Sergio Méndez Arceo