, where strikes were held following
Anna Walentynowicz's firing. These events eventually led Kuroń to helping found Solidarity. In early August 1980, workers at the
Gdańsk Shipyard went on
strike after
Anna Walentynowicz was fired for participating in the
Free Trade Unions of the Coast (WZZ; an early precursor to Solidarity). Initially, Kuroń was cautious about the strikes at the shipyard, fearing it might provoke a Soviet invasion of Poland, and advocated for "Worker Committees" to control existing unions. However, he changed his mind when
Alina Pienkowska, a worker at the shipyard, called, reporting that the shipyard workers were demanding the release of political prisoners, which made Kuroń realize that the protests were not economic but political. Soon after the
Inter-Enterprise Strike Committee (MKS) was created to represent the independent trade unions and they listed their demands over the strike in the
21 demands of the Inter-Enterprise Strike Committee. In response to this, the First Secretary and leader of the PZPR,
Edward Gierek, attacked KOR, labeling them as "anti-socialist", accusing "Kuroń elements" of radicalizing the workers to strike. To bypass legal limits, the police used "48-hour" detentions, or re-arresting immediately after release, to detain Kuroń and other KOR members. However, soon after a split within the government merged where some advocated against forcing the strike to break. Eventually, the Politburo agreed to the workers' demands, agreeing to the right to free independent trade unions, meaning Solidarity was officially formed.
Lech Wałęsa also managed to negotiate the release of Kuroń as a condition for ending the strike. However, despite this, some fights broke out among the members of the MKS, with Kuroń attacking
Waldemar Kuczyński, whom he accused of a lack of loyalty due to his willingness to compromise on the prisoner issue. Indeed, during this time, Wałęsa, influenced by the Church, specifically Archbishop Stefan Wyszyński, who opposed Kuroń and preferred a more "purely unionist path, alongside his own desire to remain the sole face of the movement, pushed Kuroń to the sidelines in decision-making for the young Solidarity. Despite this, Kuroń never tried to overthrow Wałęsa, believing that the cultivated image of Wałęsa being infallible and a charismatic symbol of the Polish working class was essential for the movement's unity and if Wałęsa himself fell, the union would collapse into factions. Thus, Kuroń tried to moderate the more radical wings of Solidarity to keep Wałęsa as a center candidate and the image. Due to this, the regime used state media to attack Kuroń specifically, hoping to portray him as the "radical advisor" due to him working with the radical wings in order to drive a wedge between the workers and the intellectuals. Solidarity was officially registered with the courts on 10 November 1980. During the
Soviet reaction to the Polish crisis of 1980–1981, which was due to the formation of Solidatiry and the Soviets fearing it would trigger a collapse in the Polish communist government, the Church started to again distance itself as while they believed in a "healthy" Solidarity, they viewed Kuroń and Michnik as "radicals" pushing the country towards catostrophe and so the leadership like Bishop
Alojzy Orszulik, specifically criticized Kuroń. In response, Kuroń wrote the article "Are We Threatened by Intervention?", in which Kuroń postulated that the Soviets would only invade if they felt Poland was completely escaping their sphere of influence and he believed that the costs to Moscow (namely Western economic blockades and war), were too high. He also publicly criticized the Church, which he felt betrayed by. However, the Soviet leadership (namely Chairman of the KGB
Yuri Andropov and General Secretary of the USSR
Leonid Brezhnev), was still furious with the Polish government that Kuroń and Michnik were allowed to "manipulate" Solidarity, and pressured then First Secretary of Poland
Stanisław Kania to arrest both. Eventually, the first National Congress of Delegates of Solidarity happened in September 1981. Two main sides former: the centrsit Christian-worker current led by Wałęsa and the left-wing, secular current associated with Kuroń and Michnik. Soon after,
Stanisław Barańczak, a lecturer at
Harvard University and a KOR activist, claimed he had heard from witnesses that Kuroń was "cruelly beaten and tortured" while in police custody. He also claimed that he was singled out "as a way of vengeance".
Jerzy Urban, speaking on behalf of the government at
Polish Radio and Television, responded to the claims of Western reports by denying them. He said that Kuroń had been interned, but said that he had been authorized to state that "not a hair of their heads has been harmed." Initially he was held in
Strzebielinek near the site of his arrest in Gdańsk, but was later transferred to
Białołęka near Warsaw. Like his arrest in 1965, he was held with Jan Rulewski. While in prison, he wrote "Theses on a Way Out of a No-Exit Situation", which argued that a national, organized uprising was inevitable and called for an attack on centers of power and information. He stated that martial law had forced him to abandon his non-violent philosophy. Many members of Solidarity called the text "insane" and "dangerous", including Michnik and
Zbigniew Bujak, fearing his statements would cause a bloodbath. Years later, Kuroń admitted the text was a mistake and stated it was written during a psychosis. In September 1982 he was moved from "internment" (meaning detention without trial) to a regular prison, and was formally charged under Article 123 of the Penal Code which was attempting to overthrow the state by force and carried a minimum of five years in prison to the
death penalty. During his time in prison, he was allowed to briefly go free twice: initially in September 1982 for the death of his father Henryk, and again for a longer time in November 1982 when his wife Grażyna died. After martial law ended in July 1983, partial amnesty was given to many KOR members except Kuroń and a few others prominent Solidarity leaders. In August, Kuroń was given an offer by the government of a passport to leave Poland with his family and stay away from politics, but he declined. In June, ahead of the trial against him formally starting, Kuroń begun a
hunger strike aimed at forcing the government to bring him to trial then or release him. The strike was seen as the action that forced the government to begin the trial early. It was held in a Warsaw district military court, and if found guilty would be sentenced from 1 to 10 years in prison. On 22 July, all four were granted amnesty by First Secretary
Wojciech Jaruzelski ahead of the 40th anniversary of Polish independence. In August he was formally freed, but soon after attacked the amnesty he was given because he could not appeal the terms of it and prove his innocence in his view, which he accused the government of doing to avoid bad publicity. During
May Day demonstrations organizied by Solidarity in 1985, ZOMO dispered participants, and Kuroń was once again arrested alongside
Seweryn Jaworski. He was afterwards immediately jailed for three months in Warsaw. He was released a few weeks later on 27 May after a Warsaw district court found him not guilty of refusing poolice orders, ruling there was "no justification". Kuroń described his release as a pivotal shift: he noted that prior the government was "insenstive" to peaceful pressure, and thus with his release there were signs of potential normalization in order to gain acceptance from the West. == Late 1980s, Round Table Talks, and elections ==