Reichsführer-SS in the context of "Waffen-SS foreign volunteers and conscripts"

The Waffen-SS (German: [ˈvafn̩ʔɛsˌʔɛs]; lit. 'Armed SS') was the combat branch of the Nazi Party's paramilitary Schutzstaffel (SS) organisation. Its formations included men from Nazi Germany, along with volunteers and conscripts from both German-occupied Europe and unoccupied lands. With the start of World War II, tactical control was exercised by the Oberkommando der Wehrmacht (OKW, "High Command of the Armed Forces"), with some units being subordinated to the Kommandostab Reichsführer-SS (lit. 'Command Staff Reich Leader-SS') directly under Reichsführer-SS Heinrich Himmler's control. It was disbanded in May 1945.

The Waffen-SS grew from three regiments to over 38 divisions during World War II. Combining combat and police functions, it served alongside the German Army (Heer), Ordnungspolizei (Order Police), and other security units. Originally, it was under the control of the SS Führungshauptamt (SS operational command office) beneath Himmler.

Einsatzgruppen (German: [ˈaɪnzatsˌɡʁʊpm̩], lit. 'deployment groups'; also 'task forces') were Schutzstaffel (SS) paramilitary death squads of Nazi Germany that were responsible for mass murder, primarily by shooting, during World War II (1939–1945) in German-occupied Europe. The Einsatzgruppen had an integral role in the implementation of the so-called "Final Solution to the Jewish question" (Die Endlösung der Judenfrage) in territories conquered by Nazi Germany, and were involved in the murder of much of the intelligentsia and cultural elite of Poland, including members of the Catholic priesthood. Almost all of the people they murdered were civilians, beginning with the intelligentsia and swiftly progressing to Soviet political commissars, Jews, and Romani people, as well as actual or alleged partisans throughout Eastern Europe.

Under the direction of Reichsführer-SS Heinrich Himmler and the supervision of SS-Obergruppenführer Reinhard Heydrich, the Einsatzgruppen operated in territories occupied by the Wehrmacht (German armed forces) following the invasion of Poland in September 1939 and the invasion of the Soviet Union in June 1941. The Einsatzgruppen worked hand-in-hand with the Order Police battalions on the Eastern Front to carry out operations ranging from the murder of a few people to operations which lasted over two or more days, such as the massacre at Babi Yar (with 33,771 Jews murdered in two days), and the Rumbula massacre (with about 25,000 Jews murdered in two days of shooting). As ordered by Nazi leader Adolf Hitler, the Wehrmacht cooperated with the Einsatzgruppen, providing logistical support for their operations, and participated in the mass murders. Historian Raul Hilberg estimates that between 1941 and 1945 the Einsatzgruppen, related agencies, and foreign auxiliary personnel murdered more than two million people, including 1.3 million of the 5.5 to 6 million Jews murdered during the Holocaust.

Heinrich Luitpold Himmler (German: [ˈhaɪnʁɪç ˈluːɪtpɔlt ˈhɪmlɐ] ; 7 October 1900 – 23 May 1945) was a German Nazi politician and military leader. He was the 4th Reichsführer of the Schutzstaffel (Protection Squadron; SS), a leading member of the Nazi Party, and one of the most powerful figures in Nazi Germany. He was also one of the main architects of the Holocaust.

After serving in a reserve battalion during World War I without seeing combat, Himmler went on to join the Nazi Party in 1923. In 1925, he joined the SS, which was initially a small paramilitary arm of the Nazi Party that served as a bodyguard unit for Adolf Hitler. Himmler rose steadily through the SS's ranks to become Reichsführer-SS by 1929. Under Himmler's leadership, the SS grew from a 290-man battalion into one of the most powerful institutions in Nazi Germany. Over the course of his career, Himmler acquired a reputation for good organisational skills and for selecting highly competent subordinates, such as Reinhard Heydrich. From 1943 onwards, he was both Chief of the Kriminalpolizei (Criminal Police) and Minister of the Interior, which gave him oversight of all police and security forces (including the Gestapo). He also controlled the Waffen-SS, a branch of the SS that served in combat alongside the Wehrmacht (Germany's armed forces) in World War II.

The Reich Security Main Office (German: Reichssicherheitshauptamt pronounced [ˈʁaɪ̯çsˌzɪçɐhaɪ̯t͡sˌhaʊ̯ptʔamt] , 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. From its very inception, the RSHA was a central institution for the Nazis, playing a pivotal role in orchestrating and executing the Holocaust.

Sicherheitsdienst (German: [ˈzɪçɐhaɪtsˌdiːnst] , "Security Service"), full title Sicherheitsdienst des Reichsführers-SS ("Security Service of the Reichsführer-SS"), or SD, was the intelligence agency of the SS and the Nazi Party in Nazi Germany. Established in 1931, the SD was the first Nazi intelligence organization and the Gestapo (formed in 1933) was considered its sister organization through the integration of SS members and operational procedures. The SD was administered as an independent SS office between 1933 and 1939. That year, the SD was transferred over to the Reich Security Main Office (Reichssicherheitshauptamt; RSHA), as one of its seven departments. Its first director, Reinhard Heydrich, intended for the SD to bring every single individual within the Third Reich's reach under "continuous supervision".

Following Germany's defeat in World War II, the tribunal at the Nuremberg trials officially declared that the SD was a criminal organisation, along with the rest of Heydrich's RSHA (including the Gestapo) both individually and as branches of the SS in the collective. Heydrich was assassinated in 1942; his successor, Ernst Kaltenbrunner, was convicted of war crimes and crimes against humanity at the Nuremberg trials, sentenced to death and hanged in 1946.

The Ordnungspolizei (Orpo, German: [ˈɔʁdnʊŋspoliˌtsaɪ], meaning 'Order Police') were the uniformed police force in Nazi Germany from 1936 to 1945. The Orpo was absorbed into the Nazi monopoly of power after regional police jurisdiction was removed in favour of the central Nazi government ("Reich-ification", Verreichlichung, of the police). In 1936, Heinrich Himmler, the commander (Reichsführer-SS) of the Schutzstaffel (SS), was appointed Chief of the German Police in the Interior Ministry. The top and upper leadership positions of the Orpo were filled by police officers who belonged to or had joined the SS. Owing to their green uniforms, Orpo members were also referred to as Grüne Polizei (Green Police). The force was established as a centralised organisation based in Berlin uniting the municipal, city, and rural uniformed police that had been previously organised on a state-by-state basis.

The Ordnungspolizei encompassed virtually all of Nazi Germany's law-enforcement and emergency response organisations, including fire brigades, coast guard, and civil defence. Himmler and Kurt Daluege, chief of the Orpo, worked to transform the police force into militarised formations ready to serve the regime's aims of conquest and racial annihilation. Police troops were first formed into battalion-sized formations for the invasion of Poland, where they were deployed for security and policing purposes, also taking part in executions and mass deportations. During World War II, the force was tasked with policing the civilian population of the occupied and colonised countries. In 1941, the Orpo's activities escalated to genocide after the Order Police battalions formed into independent regiments or were attached to Wehrmacht security divisions and Einsatzgruppen. Independently and in collaboration with those units, members of the Orpo perpetrated crimes against humanity and mass-murder during the Holocaust.

Obergruppenführer (German: [ˈoːbɐˌɡʁʊpm̩fyːʁɐ], lit. 'senior group leader') was a paramilitary rank in Nazi Germany that was first created in 1932 as a rank of the Sturmabteilung (SA) and adopted by the Schutzstaffel (SS) one year later. Until April 1942, it was the highest commissioned SS rank after only Reichsführer-SS. Translated as "senior group leader", the rank of Obergruppenführer was senior to Gruppenführer. A similarly named rank of Untergruppenführer existed in the SA from 1929 to 1930 and as a title until 1933. In April 1942, the new rank of SS-Oberst-Gruppenführer was created which was above Obergruppenführer and below Reichsführer-SS.