Bolesław Bogdan Piasecki, alias Leon Całka, Wojciech z Królewca, Sablewski (18 February 1915 – 1 January 1979) was a Polish writer, politician and political theorist. During the war, he was active in the anti-German and anti-Soviet armed underground. Initially of national radical views, he became associated after the war with the ruling Polish communists and led a group of lay Catholics who collaborated with the communist regime. In the Second Polish Republic he was one of the more prominent Polish nationalist politicians, playing an important role in the leadership of National Radical Camp. I