While the Chinese government tries to suppress all mention of the massacre on June 4 1989, activists in Hong Kong make sure that the event is not forgotten. Tom Mitchell reports from Beijing and Demetri Sevastopulo visits a new museum in Hong Kong.<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Subscribe to the Financial Times on YouTube; http://goo.gl/vUQx5k<br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes