Grey became associated with the resistance to COVID vaccination and elimination in New Zealand. She has criticised the
government response to the COVID-19 pandemic, claiming that New Zealand's work eliminating community transmission of the virus for over a year was "over-vigorous", "increasingly draconian", and "out of control". She did not observe some lockdown rules, going
paddle-boarding during
alert level 4, saying "let's break out of the fear and cotton wool mentality where we are locked inside buildings like frightened mice." She regularly shares misinformation about COVID-19 and inflates the number of deaths linked to vaccination. Grey has been assisted in her anti-vaccination organisation by former white supremacist
Kyle Chapman, Grey spread COVID-related disinformation on social media which triggered complaints to the
New Zealand Law Society and a series of bans from Facebook. Those bans were for three days in September 2021, then in November another seven days after Grey linked a death to the COVID vaccine. In February 2022, she was banned for a further 30 days.
Opposition to COVID-19 vaccination Grey was part of a legal action by the group Ngā Kaitiaki Tuku Iho Inc against Prime Minister
Jacinda Ardern, the
Minister of Health, the
director-general of health and others in the High Court. In May 2021 they challenged the legality of the New Zealand
vaccination programme, claiming it was not justified by Section 23 of the Medicines Act, a commonly-invoked provision enabling the Minister of Health to approve medicines for a "limited number of patients". The group claimed there was no need for a vaccine rollout, as
New Zealand's lockdown had been so successful at reducing spread of the virus. Grey claimed people had not been informed of the "risks" of vaccination, saying, "there's no evidence that they've been given any other alternatives – it's all 'vaccine, vaccine, vaccine'." Grey was already at Waitangi, having flown to nearby
Kerikeri the day before in a private plane. She said it seemed "so unfair that if you could afford to fly on a plane from Wellington you could get there, but there was no route for those who wanted to drive." Grey lost the case, with the court rejecting her argument that the order was unlawful, and reiterating that the vaccine was safe and effective and the rights of the workers was not being infringed. Disinformation researcher Kate Hannah claimed Grey is "a key figure in New Zealand's disinformation network" in relation to COVID-19. Hannah stated:''[Grey] has status as a lawyer; people expect her to be rigorous, thoughtful, trustworthy, clever. When she speaks about something she has a higher predictable impact than when Joe Bloggs speaks.…What motivates Sue Grey to tell you these things? Is she asking you to donate? Yes." In two radio interviews about the case, Grey falsely claimed blood from vaccinated donors contained "inflammatory factors" and was unsafe. Doctors and the national blood bank
New Zealand Blood Service pointed out this was incorrect, and that a COVID-19 vaccination is broken down quickly after injection, with all donor blood being filtered before use. A group called "Liveblood" stated in response to the ruling that they were "working tirelessly" for New Zealanders to have the "safest, freshest, best directed donor blood". On 7 December, Justice Ian Gault of the
Auckland High Court placed Baby W under the guardianship of the court. He appointed two doctors as agents of the court to provide consent for surgery, allowing the surgery to go ahead, while Baby W's parents retained guardianship on non-medical matters. On 8 December, Grey initially confirmed that the parents would not be appealing the Judge's decision to hand over guardianship of Baby W, citing the urgent medical needs of the baby. After the parents obstructed medical personnel trying to prepare Baby W for heart surgery, Gault issued an emergency allowing Police to use "reasonable force" to enforce the Court's ruling. On 9 December, Grey confirmed that Baby W had undergone a successful heart surgery operation and was recovering well. In two 2022 interviews about the case Grey used the baby's name, which was suppressed, a total of six times. One interview was livestreamed by
Liz Gunn, who also named the parents. In a decision released in 2025 the New Zealand Lawyers and Conveyancers Disciplinary Tribunal found that although Grey's mistake wasn't deliberate it still amounted to unsatisfactory (but not disgraceful or dishonourable) conduct. She was ordered to pay $14,190 in costs. == Political career ==