A Hong Kong court sentenced a barrister and activist to 15 months in prison on Tuesday for inciting an unauthorised assembly to commemorate those who died in China's 1989 crackdown on pro-democracy protesters in and around Beijing's Tiananmen Square.

Chow Hang-tung, of the since-closed Hong Kong Alliance in Support of Patriotic Democratic Movements in China, was arrested the day before the June 4 anniversary of the crackdown...