Chinese police detained a group of students on Friday who were protesting against a crackdown on a campus Marxist society, whose former head was held by police on the 125th birthday of the founder of modern China, Mao Zedong.
China has an awkward relationship with the legacy of Mao, who died in 1976 and is still officially venerated by the ruling Communist Party.
But far leftists in recent years have latched onto Mao's message of equality, posing awkward questions at a time of unprecedented economic boom that has seen a rapidly widening gap between the rich and the poor.