More than 40 of Hong Kong’s best known pro-democracy figures have been sentenced to prison terms of up to 10 years on subversion charges, in the biggest single blow to the city’s already shrinking political freedoms following Beijing’s sweeping crackdown on dissent.

The activists were arrested over a single day in 2021 and charged with “conspiracy to commit subversion” for taking part in an unofficial primary election.

Dozens of prominent Hong Kong pro-democracy activists are scheduled to be sentenced Tuesday in the biggest case under a national security law that critics say has crushed political activism in the semi-autonomous Chinese city.