The Reich Security Main Office (Reichssicherheitshauptamt, RSHA) was an organization under Heinrich Himmler in his dual capacity as Chef der Deutschen Polizei (Chief of German Police) and Reichsführer-SS, the head of the Nazi Party's Schutzstaffel (SS). The organization's stated duty was to fight all "enemies of the Reich" inside and outside the borders of Nazi Germany. Himmler established the RSHA on 27 September 1939. His assumption of control over all security and police forces in Germany was a significant factor in the growth in power of the Nazi state. With the formation of the RSHA, Himmler combined under one roof the Nazi Party's Sicherheitsdienst (SD; SS intelligence service) with the Sicherheitspolizei (SiPo; "Security Police"), which was nominally under the Interior Ministry. The SiPo was composed of two sub-departments, the Geheime Staatspolizei (Gestapo; "Secret State Police") and the Kriminalpolizei (Kripo; "Criminal Police"). In correspondence, the RSHA was often abbreviated to RSi-H to avoid confusion with the SS-Rasse- und Siedlungshauptamt (RuSHA; "SS Race and Settlement Office"). The creation of the RSHA represented the formalization, at the highest level, of the relationship under which the SD served as the intelligence agency for the security police. A similar coordination existed in the local offices, where the Gestapo, criminal police, and SD were formally separate offices. This coordination was carried out by inspectors on the staff of the local higher SS and police leaders. One of the principal functions of the local SD units was to serve as the intelligence agency for the local Gestapo units. In the occupied territories, the formal relationship between local units of the Gestapo, criminal police, and SD was slightly closer. The RSHA continued to grow at an enormous rate during World War II in Europe. Routine reorganization of the RSHA did not change the tendency for centralization within Nazi Germany, nor did it change the general trend for organizations like the RSHA to develop direct relationships to Adolf Hitler, adhering to Nazi Germany's typical pattern of the leader-follower construct.