"[Children during the Holocaust / P. Heberer. – Plymouth, 2011. – p. 481]" . "The Sicherheitsdienst, an intelligence and surveillance organization, was established in 1931 under Reinhard Heydrich. Among its major tasks were monitoring real or imagined enemies of national socialism and reporting on the state of opinion among the German public. As chief of the Sicherheitsdienst as well as of the Sicherheitspolizei, Reinhard Heydrich merged the two organizations, establishing the Reichssicherheitshauptamt in September 1939."@eng . "Sicherheitsdienst"@eng . .