against troublemakers and hooligans; Czechoslovak Television released a documentary about them called An attack on culture, and an episode of television series Thirty Cases of Major Zeman, entitled Mimicry and starring Jiří Lábus, portrayed the group as drug addicts and terrorists. The trial took place on 21–23 September 1976, and Jirous was convicted for "aggravated hooliganism", along with the musician and pastor Svatopluk Karásek, Pavel Zajíček of the group DG 307, and Vratislav Brabenec from PPU, and imprisoned for a second time, for 18 months. The trial became a cause célèbre, and organised opposition to the charges brought together for the first time the originally apolitical underground groups and political dissidents led by Havel, which eventually led to the creation of Charter 77. On his release from prison in 1977, Jirous signed the Charter, and also organised a third "festival of independent culture", at Václav Havel's country house at Hrádeček in Trutnov District. Future concerts could only be held as private events since public performances by PPU had been banned. A month after returning home, Jirous was again sentenced to time in prison after he made a speech at a exhibition about the insuperable distinction between official and unofficial culture. He served this sentence between 1977 and 1978. In 1979 he helped create the samizdat Vokno, and wrote the unfinished work The True Story of the Plastic People. He also became a member of the Committee for the Defense of the Unjustly Prosecuted (VONS). Jirous's fourth spell in prison was due to his role in producing, publishing and distributing the magazine Vokno, along with , Michal Hýbek, Milan Frič, and Jaroslav Chnápek. The trial took place in May 1982 with strict security and attended by specially selected people, loyal to the regime. The judgement deemed that articles from Vokno were antisocial, with grossly indecent subject matter and a disrespect for society. Between 1981 and 1985, Jirous was again imprisoned, officially for disturbing the peace, but also, according to Amnesty International and VONS, for unsubstantiated charges of illegal possession of marijuana, allegedly found during a house search. In 1984, Jirous was named Prisoner of the Month by Amnesty International. It was during this time that he wrote the poems later collected as Magor's Swan Song (), for which he later won the Tom Stoppard Award. Between 1985 and 1987, Jirous was under supervision as part of his previous convictions, and had