Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. History of Polish intelligence services. Prometheism, Polish contribution to World War II, Home Army and V1 and V2, Main Directorate of Information of the Polish Army, S u ba Bezpiecze stwa, Ministry of Public Security of Poland, Feliks Ankerstein, Edmund Charaszkiewicz, Roman Czerniawski, Józef Englicht.