People prepares to mark the anniversary of the events of October 2, 1968.
They will continue with their protests.
Some parents say teachers threatened not to pass their children if they didn't support the union, whose demands ranged from higher pay to the resignation of a former governor.
They were against the construction of a second floor.
"We call on authorities investigating the case and our government to act with full justice and in accordance to human rights because we believe in the innocence of our family members, who have dedicated part of their lives to this prison and we believe in their innocence," said a relative of a prison guard.
The complaints of torture have increased 600% in the past ten years, according to the organization.
The CNTE is demanding to be able to air their opposition to the national tests for educators.
The demonstrations will depart at 10:00 hrs. from Taxqueña, Indios Verdes, Zaragoza and the National Auditorium towards the Angel of Independence Monument. Once there, the protesters will march towards the Zócalo at 16:00 hrs.