Protesters wearing masks to curb the spread of the coronavirus wave flags in a shopping mall during a protest against China's national security legislation for the city, in Hong Kong, Friday, May 29, 2020. One year ago, a sea of humanity _ a million people by some estimates _ marched through central Hong Kong on a steamy afternoon. It was the start of what would grow into the longest-lasting and most violent anti-government movement the city has seen since its return to China in 1997. (AP Photo/Kin Cheung, File)