[https://www.google.com/amp/s/amp.theguardian.com/world/2016/may/11/the-cultural-revolution-50-years-on-all-you-need-to-know-about-chinas-political-convulsion](https://www.google.com/amp/s/amp.theguardian.com/world/2016/may/11/the-cultural-revolution-50-years-on-all-you-need-to-know-about-chinas-political-convulsion) "Fifty years ago one of the bloodiest eras in history began, in which as many as two million people died. But who started it and what was it for?"