Until the end of 2024, Leung accumulated 25 convictions, some of which were for unauthorized assembly. On 18 April 2020, Leung was arrested as one of 15 Hong Kong high-profile democracy figures, on suspicion of organizing, publicizing or taking part in several unauthorized assemblies between August and October 2019 in the course of the
anti-extradition bill protests. Following protocol, the police statement did not disclose the names of the accused. A day prior to his arrest, he was stabbed with a sharp object while demonstrating in solidarity with pro-democracy legislator
Dennis Kwok, who had been strongly criticized by the pro-Beijing camp. The attack happened in front of the Liaison Office and he was helped by fellow activist
Raphael Wong before being moved to a hospital, where he was later discharged at his own request. In September 2020, the 81-year-old man who stabbed him went on trial for the attack and was controversially praised by the magistrate for "loving society". The elderly man was also quoted as saying he wanted activists
Joshua Wong and
Ted Hui "to die as soon as possible", and included Leung in the same wish. He was sentenced in October 2020 to a prison term of three months and six days. In August 2020, Leung was among a large group of pro-democracy figures charged for the banned vigil commemorating the
31st anniversary of the 1989 Tiananmen Square protests. On 6 September 2020, he was arrested when protesting the postponement of the 2020 Hong Kong Legislative Council election. On 15 September 2020 he appeared before the court for the banned Tiananmen anniversary gathering where he criticized the
Chinese Communist Party. On 8 December 2020, Leung was arrested again for "unauthorised assembly" during the July 1 protest of that year and was released on bail pending a court appearance. His party condemned his arrest.
Arrest under National Security Law On 6 January 2021, Leung was arrested along with more than 50 other pan-democrats, accused of violating the
national security law over their participation in the pro-democracy primaries of 2020. He was accused of "subverting state power." Leung was released on bail on 7 January. On 28 February 2021, Leung was formally charged, along with 46 others, with subversion and was arrested again. On 4 March, he was denied bail and he remained in prison. On 12 March, Leung was again denied bail citing national security risks. On 29 March 2021, the
High Court denied him bail again and he will remain in custody until the next hearing on the case on 31 May 2021. On 13 May 2021, High Court judge Esther Toh, upheld her decision to deny bail to Leung alleging his determinate opposition to the government and the national security law. Toh also argued that Leung had foreign and international support if released and that he was at high risk of reoffending. On 5 September 2022, Leung pleaded not-guilty to subversion charges. On 30 May 2024, Leung was found guilty of conspiracy to commit subversion. On 19 November 2024, Leung was sentenced to six years and nine months in prison.
Convictions On 16 April 2021, Leung was found guilty of taking part in unauthorised assembly and was sentenced to 18 months' imprisonment. On 24 May 2021, Leung pleaded guilty over another unauthorised assembly in 2019 which turned violent. Leung was defiant during the mitigation hearing in court and said that however he pleaded guilty, he believed he had done nothing wrong. On 28 May 2021, Leung was sentenced to an additional 18 months' imprisonment over the 2019 unauthorised assembly. On 16 October 2021, Leung was sentenced to further eight months' imprisonment over un unauthorised assembly in July 2020, in a protest against the national security law. In March 2022, an additional sentence of two weeks in prison was added to Leung's overall sentence, after he was convicted of contempt during his time at LegCo. In July 2022, Leung and seven other activists, appealed his conviction for violating COVID-19 restrictions during Labour Day in 2020, citing "disproportionate" measures from the government. On 18 October 2022, the appeal was rejected by a court.
Health in prison In early May 2022, Leung's wife said that Leung had been frequently visiting hospital from prison due to a
heart condition, but dismissed rumors that Leung was seriously ill with
COVID-19. Leung's wife also said that his mental health had "upheavals". ==Image and sartorial preference==