Lech Aleksander Kaczyński (Polish pronunciation: [ˈlɛx alɛkˈsandɛr kaˈt͡ʂɨȷ̃skʲi] ( listen); 18 June 1949 – 10 April 2010) was a Polish lawyer and politician who served as the President of Poland from 2005 until 2010 and as Mayor of Warsaw from 2002 until 22 December 2005. Before he became a president, he was also a member of the Law and Justice party. He was the identical twin brother of the former Prime Minister of Poland and current Chairman of the Law and Justice party, Jarosław Kaczyński. On 10 April 2010, he died in the crash of a Polish Air Force Tu-154 while attempting to land at Smolensk-North airport in Russia.

Kaczyński was born in Warsaw, the son of Rajmund (an engineer who served as a soldier of the Armia Krajowa in World War II and a veteran of the Warsaw Uprising), and Jadwiga (a philologist at the Polish Academy of Sciences). As a child, he starred in a 1962 Polish film, The Two Who Stole the Moon (Polish title O dwóch takich, co ukradli księżyc) with his twin brother Jarosław.

Marek Jurek (Polish pronunciation: [ˈmarɛk ˈjurɛk]; 28 June 1960 in Gorzów Wielkopolski, Poland) is a Polish right-wing politician, who does not have a parliamentary seat. Since 20 April 2007 he has been the leader of the aspirant party Right of the Republic, which does not have any MPs.

He is a graduate in history from Adam Mickiewicz University in Poznań. In the 1980s he was an activist in the anti-communist movement in Poland. After the fall of the communism in 1989, he was one of the founders of the now defunct political party Christian National Union. He was a deputee in the Contract Sejm and later in the Sejm of the Republic of Poland from 1991 to 1993.

From 1995 to 2001 he was a member of the National Broadcasting Council. In 2001, he was elected a deputee of the Sejm again, this time as a member of the Law and Justice party. On 26 October 2005 he was elected a Sejm marshal (parliament speaker) nominated by Law and Justice with 265 votes (133 votes were given to Bronisław Komorowski from Platforma Obywatelska). On 13 April 2007 he resigned from the post, following the Sejm's failure to amend the Constitution to protect prenatal life. On the following day, he left Law and Justice to found his own party, now known as the Right of the Republic. His resignation was accepted on 27 April 2007.