pamphlets of chairman Nathan Law, who was running in Hong Kong Island, were also delayed as the Hongkong Post had to seek legal advice from the justice department regarding Law's pamphlets mentioning phrases such as "self-determination". Law, 23, eventually became the youngest candidate ever to be elected to the Legislative Council after he received 50,818 votes, the second-highest among all candidates in the constituency. Demosistō's electoral allies, environmentalist Eddie Chu and university lecturer Lau Siu-lai who ran with a similar platform of "self-determination" also won seats in New Territories West and Kowloon West. In the Legislative Council, Demosistō and its allies joined the 27-strong pro-democracy caucus. In the 2017 Chief Executive election, the party and other radical democrats backed the League of Social Democrats legislator Leung Kwok-hung to run against the two former government officials Carrie Lam and John Tsang, who was backed by the mainstream pro-democrats. Leung later dropped out after failing to grab enough signatures in an unofficial civil petition. Disqualifications and imprisonment of members In July 2017, Nathan Law was ousted from the Legislative Council over their manners at the oath-taking ceremony at the inaugural meeting with three other pro-democracy legislators, Leung Kwok-hung, Lau Siu-lai and Yiu Chung-yim, losing the party's only elected representation. The controversy, triggered by two pro-independence legislators, Sixtus Leung and Yau Wai-ching of Youngspiration resulted in the unprecedented legal actions by the government against elected legislators and the controversial interpretation of the Basic Law of the Standing Committee of the National People's Congress (NPCSC) which led to the disqualification of the six legislators as a result. On 17 August 2017, Nathan Law and Joshua Wong, the chairman and the secretary-general of Demosistō, were imprisoned alongside former general secretary of the Hong Kong Federation of Students Alex Chow for their storming into the Civic Square which triggered the 79-day 2014 Hong Kong protests. Agnes Chow, core member of Demosistō, announced her candidacy for the seat left vacant by Nathan Law in the 2018 Hong Kong Island by-election. However, her candidacy was disqualified by the Electoral Affairs Commission of the basis that she "cannot possibly comply with the requirements of the relevant electoral laws, since advocating or promoting 'self-determination' is contrary to the content of the declaration that the law requires a candidate to make to uphold the Basic Law and pledge allegiance to the [Hong Kong Special Administrative Region]." In the 2019 District Council