Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. NKVD Order 00485 "On liquidation of Polish sabotage and espionage groups and units of POW (Polish Military Organization, Polska Organizacja Wojskowa) " (" - ") approved on August 9, 1937 by the VKP(b) Central Committee Politburo and signed by Nikolai Yezhov, the People''s Commissar for Internal Affairs on August 11, 1937 laid the foundation for systematic repressions of ethnic Poles in 1937 and 1938. The operation was one of national operations of the NKVD. According to the Order, the list of those subject to repression included, among others, "former Polish prisoners of war, defectors from Poland, Polish refugees, Polish political émigrés, those admitted through prisoners'' exchange ( ), former members of PPS and other Polish political parties".