The revolution also aimed to "sweep away" all "cow demons and snake spirits", that is, all the class enemies who promoted bourgeois ideas within the party, the government, the army, among the intellectuals, as well as those from an exploitative family background or who belonged to one of the Five Black Categories. Large numbers of people perceived to be "monsters and demons" regardless of guilt or innocence were publicly denounced, humiliated, and beaten. In their revolutionary fervor, students especially the Red Guards denounced their teachers, and children denounced their parents. Many died through their ill-treatment or committed suicide. In 1968, youths were mobilized to go to the countryside in the Down to the Countryside Movement so they may learn from the peasantry, and the departure of millions from the cities helped end the most violent phase of the Cultural Revolution.