The milestone was largely ignored Monday in the Chinese media, reflecting continuing sensitivities about a period that was later declared a "catastrophe."
Authorities have generally suppressed discussion of the violent events, now a couple of generations removed from the lives of young Chinese focused on pursuing their own interests in an increasingly capitalistic society.
On May 16, 1966, the ruling Communist Party's Politburo met to purge a quartet of top officials who had fallen out of favor with Mao. It also produced a document announcing the start of the decade-long Cultural Revolution to pursue class warfare and enlist the population in mass political movements.
Despite the party's formal repudiation of the movement five years after it ended, vestiges of the Cultural Revolution continue to echo in China's authoritarian political system, the intolerance of dissent and uncritical support for the leadership, said veteran journalist Gao Yu, who was a university student in 1966.
"I saw so many respected teachers in universities and high schools get beaten up," Gao said. "The movement wasn't so much a high-profile political struggle as a massive campaign against humanity."
A longtime party critic, Gao, now 72, was allowed to return home last year on medical parole after being imprisoned on a state secrets charge related to her publicizing a party document about ideological controls.
