The Black Book was the post-war name given to the Sonderfahndungsliste G.B. ('Special Search List G.B'), the list of prominent Britons to be arrested in the case of a successful invasion of Britain by Nazi Germany in World War II. The list was a product of the SS Einsatzgruppen and compiled by Walter Schellenberg. It contained the names of 2,820 people, British subjects and European exiles, living in Britain who were to be immediately arrested if Unternehmen Seelöwe, the invasion of Britain, succeeded.