Ma Chun-man was convicted of inciting secession on Monday after he was found to have chanted slogans such as "Hong Kong independence, the only way out" on 20 occasions in 2020.
The cancellation came days after pro-Beijing newspaper Ta Kung Pao accused Ho of being "anti-China" due to her involvement in the 2019 pro-democracy movement in Hong Kong.
The Hong Kong government cut ties with the pro-democracy union last week and accused it of spreading anti-Beijing and anti-government sentiment.
Tong Ying-kit was convicted Tuesday of inciting secession and terrorism for driving his motorcycle into a group of police officers during a July 1, 2020, rally.
A day earlier, four journalists from the now-defunct pro-democracy Apple Daily newspaper were indicted for violations of the national security law.
Lam Man-chung, who was the executive editor-in-chief of Apple Daily, was arrested on suspicion of conspiring to collude with foreign forces to endanger national security.
Tong Ying-kit, 24, was tried for driving his motorbike into a group of police officers while carrying a flag bearing the protest slogan Liberate Hong Kong, Revolution of our times in July last year.
Authorities say the primaries were part of a plot to paralyse Hong Kong's government and have cracked down heavily on dissent following months of anti-government protests in 2019.
Police said they arrested a 57-year-old man at the airport on Sunday night under the national security law, but did not identify him.
Tong Ying-kit, 24, was arrested the day after the sweeping new law came into effect when he allegedly drove his motorcycle into a group of police officers during protests on July 1 last year.
The paper and its jailed owner Jimmy Lai have long been a thorn in Beijing's side with unapologetic support for the financial hub's pro-democracy movement.
Lai, who is already behind bars for taking part in earlier protests, must now serve a total of 20 months after pleading guilty to organising, participating in an unlawful assembly on 1 October 2019.
Hong Kong has long been seen as one of the best places to do business globally, highly regarded for its skilled workforce, business-friendly legal system and ease of movement.