 Complete the following phrase:  Students at UNAM, along with other Mexico City universities, mobilized in what has come to be called Mexico 68, protests against the 1968 Mexico City Olympics, but also a whole array of political and social tensions. During August 1968, protests formed on the main campus against the police actions on the main campus and in the center of the city. The protests grew into a student movement that demanded the resignation of the police chief, among other things. More protests followed in September, gaining frequency and numbers. During a meeting of the student leaders, the army fired on the Chihuahua building in Tlatelolco, where the student organization supposedly was. In the 