As a student, Piskorski joined the
Polish People's Party. He was also active in various societies promoting the idea of
pan-Slavism. He was an activist of the far-right
neo-pagan "
Niklot" society and worked in organizations with a popular-patriotic profile, such as the
National-Democratic Party. An influence on his political activities was the ideas of Polish political philosopher
Jan Stachniuk (leader of the pre-war society "
Zadruga"). Those ideas combine on the one hand passionate patriotism, and on the other consequent anti-capitalism and anti-globalism. In 2000, he travelled to Russia at the invitation of
Pavel Tulaev to meet with other far-right and pan-Slavic activists there. He maintains close contacts with
continentalists from all over Europe who consistently argue for "de-Americanisation of the Old Continent" and for the construction of Euro-continental cooperation "from Lisbon to Vladivostok". In 2000, Piskorski quit the People's Party and in 2002 joined the
Self-Defence of the Republic of Poland party to become the assistant to Member of Parliament
Jan Łączny. He quit his PhD in 2005 to devote himself to politics. In 2005, he also became one of principal members of
Andrzej Lepper's electoral committee during the
Polish 2005 presidential election. In the
Polish 2005 parliamentary election, Piskorski successfully ran for the
Sejm from the
Szczecin constituency. As a deputy. he was a vice-chairman of the Reprivatization Committee and worked in the Foreign Affairs Committee and the Statutory Committee. He also represented Polish Parliament in the Assembly of Western European Union. The following year, he also ran for president of Szczecin in the
2006 local elections, but withdrew before the elections and supported a
Law and Justice candidate instead. He failed to defend his seat in the
Polish 2007 parliamentary election and failed to return to the parliament in the
2011 parliamentary election (this time running as a candidate of
Polish Labour Party (Sierpień 80)). in 2023. In February 2015, Mateusz Piskorski founded a new political party called "
Zmiana" ("Change"), being a political platform that combines left-wing anti-capitalist views with anti-imperialist, pacifistic social policies. At the founding meeting, were representatives of the self-proclaimed
Novorossiya to inform the Polish public about their views on the
Russo-Ukrainian War. Piskorski and his wife Marina Klebanovich received funding from Russian actors through "The International Agency for Current Policy". Klebanovich worked as a coordinator for the Agency's operations in Europe. In May 2016, shortly before the
NATO summit, Piskorski was detained by the
Internal Security Agency on the charges of "cooperation with Russian intelligence services, meeting intelligence officers and undertaking operational tasks from them as well as accepting payments". Sources internal to the Zmiana party have described the detention as: "an attempt to intimidate those whose views on foreign, domestic and socioeconomic policy differ from those of the government".
UN Working Group on Arbitrary detentions has asked to release him, in 2018. On 16 May 2019 Piskorski was released on bail. Both rightists such as
Janusz Korwin-Mikke and
Grzegorz Braun and leftists such as
Piotr Ikonowicz supported his release. Since 2025, Piskorski came to be described as a
national communist. ==Election monitoring==