On January 6, more than 50 activists were arrested  in Hong Kong under the national security law  for having participated last year in the pan-democratic camp's primaries for the 2020 Legislative Council (LegCo) elections which were eventually postponed .
Those arrested include Benny Tai, the initiator of the primaries; the spokesperson of Power of Democracy (a coordinating body of the primaries), Andrew Chiu; and former lawmakers James To, Wu Chi-wai, Andrew Wan, Lam Cheuk-ting, Helena Wong, Au Nok-hin, Chu Hoi-dick, Alvin Yeung, Kwok Ka-Ki, Jeremy Tam and Gary Fan. Also arrested were candidates who took part in the primaries, including Lester Shum, Clarisse Yeung, Tiffany Yuen, Ventus Lau, Gwyneth Ho, Fergus Leung, Owen Chow, Winnie Yu, Jeffrey Andrews, Sam Cheung and Ben Chung.
Lawyer John Clancey, who served as treasurer of Power for Democracy, was also arrested  and the law firm with which he was affiliated raided by police. The home of Joshua Wong’s was also raided, as the activist–who is currently in prison –had also taken part in the primaries.
Freelance journalist Holmes Chan shared a list of those arrested on Twitter:
#Update  1415: This is the latest list. We haven't received reports of fresh arrests, but some names have had their status change to “verified.” I've also added supplementary info.
— Holmes Chan (@holmeschan_) January 6, 2021 
In addition to the arrests, Robert Chung and Chung Kin-wah, CEO and deputy CEO, respectively, of the Hong Kong Public Opinion Research Institute (PORI), which had provided logistics for the polling of the primaries, were summoned by police to assist the investigation. A number of pro-democracy media outlets, including Apple Daily News, Stand News and inmediahk, and received court orders directing them to hand in documents related to police investigations.
#HongKong  police demanded independent news outlets, @StandNewsHK  @inmediahk  @appledaily_hk  to hand over documents “in connection with national security cases within seven days.” @RSF_inter  denounces this harassment and urges for full press freedom in the territory to be restored.
— RSF in English (@RSF_en) January 6, 2021 
Over 600,000 Hongkongers cast their votes in the July 2020 primaries to choose the candidates who would contest the LegCo election in September. The pro-democracy camp's plan was to win more than 35 seats in the LegCo so that their representatives would have the power to veto the government’s budget.
After the primaries, Hong Kong Chief Executive Carrie Lam stated that  as the objective of the primaries was to obstruct the implementation of government policy, the act could be viewed as “subversion” under the then-newly enacted national security law.
Beijing’s Liaison Office in Hong Kong also issued a statement, accusing Benny Tai of plotting to seize the government’s power. Carrie Lam later used COVID-19 emergency powers to postpone the elections.
Hong Kong Secretary for Security John Lee’s comment on the mass arrest echoed Carrie Lam's and Beijing’s previous statements. Citing Benny Tai’s commentary in Apple Daily about political developments from 2020-2022, Lee said :
The people involved are suspected of making use of what they call a 35+ plan and a ten-step mutual destruction scheme to someway [sic] paralyse the Hong Kong government.
Benny Tai predicted in April 2020 that the national security law would not be implemented until the end of 2021, but Beijing passed the law 18 months earlier to crack down on democratic forces in Hong Kong.
Civic Party chairman Alan Leong stressed in a press conference  that it is the constitutional right of lawmakers to vote against a budget. The chairman of the Democratic Party, Lo Kin-hei also expressed the belief that the arrests are in retaliation against politicians who have the backing of the people.
#HongKong ‘s pro-democracy camp say the authorities are clearly just taking revenge on politicians that have the support of the people, asking why the police took so many months to respond to their Legco primaries if they amounted to such a serious crime. https://t.co/XKsYTES5TL 
— RTHK English News (@rthk_enews) January 6, 2021 
China researcher at Human Rights Watch Maya Wang commented:
— Maya Wang 王松莲 (@wang_maya) January 6, 2021 
Many, including artist-activist Baidiucao, have criticized the European Union for signing an investment deal with China  at the expense of Beijing’s political crackdown in Hong Kong:
Without EU🇪🇺 assurance to Beijing recently, there won’t b today’s HK massive arrest on 50+ pro democracy figures.
— 巴丢草 Badiucao (@badiucao) January 6, 2021 
Exiled activist Nathan Law issued this appeal to the European Parliament:
In response to Hong Kong's political crackdown, I urge the European Parliament to halt the EU-China investment deal and EU to sanction China&HK officials who are responsible to the arrests.#Retweet  if you agree MEP should VETO the bill and EU should act.#StandwithHongKong 
— Nathan Law 羅冠聰 😷 (@nathanlawkc) January 6, 2021 
Antony Blinken, US President-elect Biden's nominee for the post of Secretary of State, was quick to assure the people of Hong Kong of the Biden-Harris administration's support:
The sweeping arrests of pro-democracy demonstrators are an assault on those bravely advocating for universal rights. The Biden-Harris administration will stand with the people of Hong Kong and against Beijing’s crackdown on democracy. https://t.co/nSj8dr3OEg 
— Antony Blinken (@ABlinken) January 6, 2021 
And activist investor David Webb drew an analogy between the crackdown on democracy and the pandemic:
Never thought I'd see the day in #HK  when more pan-democrats are arrested than there are pandemic cases. But then the Government's target is zero, after all. The problem is that the majority of the population has already been infected and there's no vaccine for democracy.
— Webb-site (@webbhk) January 6, 2021 
On January 6, 2021, the number of newly confirmed COVID-19 cases in Hong Kong was 20.