After World War II , it was used by NKVD , and between 1947 and 2004 , a delegation of Polish Supreme Audit Office used the building . On the facade a plaque by Alexander Dętkoś , unveiled on September 17 , commemorates Polish Border Guard personnel murdered by NKVD soldiers during the Katyn massacre
Katyn massacre
Katyn massacre
Ossoliński Alley in Bydgoszcz