Available Oct 19. President Diaz Ordaz orders the army to take over the UNAM. Dean Barros Sierra, feeling threatened, sends a letter of resignation to the university's governing body. Martinez Manatou asks the president to open a new line of communication with the students by pointing out the enormous political weight that the resignation of Barros Sierra could have on the presidency. Barrientos and Echeverria are open to dialogue, as they want the student body to feel less threatened by the government, thus lowering their guard. Once the presidency opens dialogue with the students, Barrientos, with the help of the CIA, wants to initiate a plan of violence and riots to corner the President and force him to order a definitive solution to the student problem.