Red Guard
The Red Guard were a paramilitary group during the Cultural Revolution of the 1960s, mostly made up of high school and college students. Mao basically encouraged them to go nuts accusing anyone and everyone of any kind of made-up crimes against the state and then let them murder and otherwise torment people including their own family members.
Once their usefulness ran out, many were executed, and millions were sent to the countryside for "re-education".
A sampling of what took place was this:
"Attacks on culture quickly descended into attacks on people. Ignoring guidelines in the 'Sixteen Articles' which stipulated that persuasion rather than force were to be used to bring about the Cultural Revolution, officials in positions of authority and perceived 'bourgeois elements' were denounced and suffered physical and psychological attacks. On 22 August 1966, a central directive was issued to stop police intervention in Red Guard activities. Those in the police force who defied this notice were labeled "counter-revolutionaries." Mao's praise for rebellion effectively endorsed the actions of the Red Guards, which grew increasingly violent.
"Public security in China deteriorated rapidly as a result of central officials lifting restraints on violent behavior. Xie Fuzhi, the national police chief, said it was "no big deal" if Red Guards were beating "bad people" to death. The police relayed Xie's remarks to the Red Guards and they acted accordingly. In the course of about two weeks, the violence left some 100 teachers, school officials, and educated cadres dead in Beijing's western district alone. The number injured was "too large to be calculated.""1