Hong Kong media tycoon Jimmy Lai, a high profile critic of Beijing, was arrested Friday for taking part in last year’s pro-democracy protests that rocked the city for seven months.

The 72-year-old owner of the Apple Daily newspaper is accused of joining a rally on August 31 that had been banned by police for security reasons.

Lai was arrested and charged along with veteran pro-democracy activists Lee Cheuk Yan and Yeung Sum, police said.

The trio could be jailed for up to five years if convicted of taking part in an “unauthorized assembly”. They are due to appear in court on May 5.

Tens of thousands of protesters defied the police ban on the demonstration marking the anniversary of Beijing’s rejection of a call for universal suffrage for Hong Kong that sparked the 2014 “Umbrella Movement”.

Some gathered in the name of a religious procession — which does not require police approval — while others claimed they were shopping.