Hong Kong was once a place where people did not live in fear. It had rule of law, a rowdy press and a semi-democratic Legislature that kept the powerful in check. The result was a city with a freewheeling energy unmatched in China. Anyone who grew up in China in the 1980s and 1990s could sing the Cantopop songs of Hong Kong stars like Anita Mui, and that was a problem for Beijing: Freedom was glamorous, desirable.

When Britain handed Hong Kong back to China in 1997, the city’s people accepted, in good faith, Beijing’s promises that its capitalist system and way of life would remain unchanged for 50 years and that the city would move toward universal suffrage in the election of its leader.

Not anymore. Now Hong Kong people are quietly taking precautions, getting rid of books, T-shirts, film footage, computer files and other documents from the heady days when the international financial center was also known for its residents’ passionate desire for freedom.