The KOR Committee for Social Self-Defense (Polish: Komitet Samoobrony Społecznej KOR) was a Polish civil society group that emerged under the communist rule. It was created in 1977-1978 from the Workers' Defense Committee (Komitet Obrony Robotników). It was one of the movements whose activities led to the creation of Solidarity. The KOR was absorbed into Solidarity in 1981.
Jarosław Aleksander Kaczyński (born 18 June 1949) is a Polish politician. He co-founded the Law and Justice (PiS) party in 2001 with his twin brother, Lech Kaczyński, and has served as its leader since 2003. He served as Prime Minister of Poland from 2006 to 2007, and has twice held the post of Deputy Prime Minister of Poland, first from 2020 to 2022, and a second time from June to November 2023. He is considered to have been the eminence grise of Poland, when PiS formed the government in 2005–2007 and again in 2015–2023, with direct political influence over the prime ministers Kazimierz Marcinkiewicz, Beata Szydło and Mateusz Morawiecki.
Jaroslaw Kaczyński as a student took part in protest during the March 1968 political crisis. Subsequently, he became involved in the anti-communist opposition as a collaborator of KOR and KSS KOR. He took part in the protests in August 1980 when he was arrested, then joined the Solidarity movement. In 1982 he became a member of the Polish Helsinki Committee. He took part in the 1988 strikes.