A bronze plaque on house no. 652 in Preslova street 19, Prague 5 - Smíchov (Czech republic) is dedicated to Mr.Jan Sadílek (* 1884 - † 1940). In time of the protectorate was a member of an illegal organization Defence of the Nation (ON). Jan Sadílek (as a member of ON) worked as a close associate of Joseph Balaban. Sadilek was also a publisher of the illegal magazine "V boj". He was an organizer of transitions of people across borders of protectorate into exile abroad.