For many years, Hong Kong has been the only place on Chinese soil where large crowds could commemorate the Tiananmen Square massacre of 1989. Now, anyone holding a vigil there can be sent to prison for up to five years. Holding a candlelight remembrance is explicitly declared a “threat to public order” — and another facet of Hong Kong’s autonomy is being stripped away. The World’s Patrick Winn spoke with Hong Kong native Louisa Lim, author of “The People’s Republic of Amnesia.”