Hong Kong's top court is reviewing a law that prohibits calls to boycott elections, with challengers arguing it infringes on rights to free expression and informed voting. The government contends the law is necessary.

Hong Kong’s top court has been asked to abolish an “extraordinary” and “inexplicable” law prohibiting calls to boycott the city’s “patriots-only” elections on the grounds that it violates residents’ rights to express disapproval of the political system and to make informed decisions before voting. A government senior counsel opposed the challenge by former Chinese University of Hong Kong student union president Jacky So Tsun-fung, arguing the law fell outside the scope of constitutional review.....