There were different Red Guard factions, each competing to be Chairman Mao's 'favorite.'...During the political campaign of criticizing Liu Shaoqi (the President of the State) and Deng Xiaoping (General Secretary of the Party), Maos key rivals, in the late months of 1966,...the Red Guards, were divided into two rival factions nationwide: rebels and conservatives..."
-Yongyi Song, Chronology of Mass Killings during the Chinese Cultural Revolution (1966-1976)
"[Red Guards] are violent against the teachers and the so called class enemies. Then, gradually, they got power and they started to go against each other..There are some differences between those factions, but I have to say, basically, they are the same. They are violent. They are cruel to those who are accused of being enemies."
All quotes from Yongyi Song's Chronology of Mass Killings during the Chinese Cultural Revolution (1966-1976)