UPDATE: More information on arrest of Mateusz Piskorski
The arrest of Mateusz Piskorski is a manifestation of growing political repression and preventive measures before the upcoming NATO summit. It may be tied with the fact that Piskorski intended to publish a book about the mysterious circumstances of the death of Andrzej Lepper.
Andrzej Zbigniew Lepper was a Polish politician who was the leader of Samoobrona RP (Self-Defense of the Republic of Poland) political party.
He was the Deputy Prime Minister and Minister of Agriculture and Rural Development between 5 May 2006 and 22 September 2006, and again from 16 October 2006 to 9 July 2007, in the cabinet of Jarosław Kaczyński. Lepper's civil profession prior to entering politics was farming in the village of Zielnowo, Pomerania.
He was a candidate in the Polish presidential election in 1995, 2000, 2005 and 2010.
Lepper was found dead in his Warsaw office on 5 August 2011. Police said that he likely committed suicide. However, many people think that it was not a suicide, and that it was a political murder.
More on this from Katehon:
The reason for the repression against Zmiana is its anti-Atlanticist geopolitical position. The party and its leader are in favor of the restoration of Poland's sovereignty, stand against the Republic of Poland's membership in NATO, and have criticized the transformation of the country into an American colony which is being dragged into a possible confrontation with Russia. Piskorski and fellow activists visited Russian Crimea, where they participated as observers of the referendum on Crimea’s self-determination, and supported the peoples republics of Donbass against the Bandera regime in Kiev. Mateusz Piskorski is one of the leaders of the European Center for Geopolitical Analysis, a Euro-continentalist think thank.