"Established in Cologne in 1950, the Bundesamt für Verfassungsschutz (BfV) is the German domestic intelligence agency."@en . . "Correspondence with Bundesamt für Verfassungsschutz (BfV)"@en . . . "This material has been digitised. Readers should book a reading room terminal to access it."@en . . "Correspondence mainly regarding background information on several individuals. This includes Paul George de Bruyn Ouboter, a former Dutch or German SS-member with unclear identity. Moreover, several publications and current political issues are discussed. The main correspondent for BfV is Otto John, former anti-Nazi resistance fighter and the agency’s first president."@en . "49 letters"@en . . . . . . "WL3000/9/1/232" .