In common usage, a collection is any group of items that has one or more properties in common. For example, paintings from the same artist, or coins from Germany before 1900, see collecting and collectible.
... (DGSE)
Secretariat General de la Defense Nationale[?] (SGDN)
Germany
Bundesnachrichtendienst[?] (BND)
Nazi Germany
Abwehr, WW2
Gestapo
Sicherheitsdienst (SD; ...