The supporters of the defendants criticized the judge for the "heavy" sentence.
Hong Kong Protests
The 65-year-old is an icon of the city's pro-democracy protests.
The actor is known for his pro-Beijing views.
US lawyer sentenced to 4 months in jail for scuffling with plainclothes officer in MTR station in 2019
He was earlier found guilty of officer assault.
July 1 marks the 24th anniversary of the city's handover to China.
The case is being handled by the national security department.
Many news vendors had already sold out of the paper by early morning.
The closure is a massive blow to the city's fast dwindling press freedoms.
The paper could shut down altogether if authorities do not unfreeze their funds soon.
The banner had an illegal slogan that connotes Hong Kong independence under the security law.