Operation Hummingbird (German: Unternehmen Kolibri)   

                     The Night of the Long Knives (German: Nacht der langen Messer), also called the Röhm purge (German: Der Röhm-Putsch) or Operation Hummingbird (German: Unternehmen Kolibri), was a purge that took place in Nazi Germany from 30 June to 2 July 1934. Chancellor Adolf Hitler, urged on by Hermann Göring and Heinrich Himmler, ordered a series of political extrajudicial executions intended to consolidate his power and alleviate the concerns of the German military about the role of Ernst Röhm and the Sturmabteilung (SA), the Nazis' paramilitary organization, known colloquially as "Brownshirts". Nazi propaganda presented the murders as a preventive measure against an alleged imminent coup by the SA under Röhm – the so-called Röhm Putsch.