The thick line (, or , ) was the term used by Prime Minister of Poland, Tadeusz Mazowiecki, in an exposé[pl] he delivered to the Contract Sejm, on 12 September 1989.Gerald J. Beyer, "What Ever Became of Solidarity?" America magazine, January 16, 2006. Retrieved October 20, 2011.

He said, "We split away the history of our recent past with a thick line. We will be responsible only for what we have done to help extract Poland from her current predicament, from now on". ()Dominika Blachnicka - Ciacek, Reading Mazowiecki's expose twenty years later

In more recent years, his intentions have been reconsidered, and his is often understood as a policy of nonpunishment for crimes committed by the communist regime of pre-1989 Poland.Tadeusz Mazowiecki, Solidarity Takes PowerD. Szporer, Solidarity: The Great Workers Strike of 1980 on Google booksDaniela Ivanova, Tadeusz Mazowiecki

See also Polish Round Table Agreement Lustration in Poland Vergangenheitsbewältigung Red line

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