Jimmy Lai, the pro-democracy former Hong Kong media tycoon and a fierce critic of Beijing, has been sentenced to 20 years in prison in one of the most prominent cases prosecuted under a China-imposed national security law.

HONG KONG (AP) — Jimmy Lai, the pro-democracy former Hong Kong media tycoon and a fierce critic of Beijing, was sentenced on Monday to 20 years in prison in the longest punishment given so far under a China-imposed national security law that has virtually silenced the city’s dissent.

His co-defendants, six former employees of his Apple Daily newspaper and two activists, received prison terms of between 6 years and 3 months, and 10 years on collusion-related charges.