The German code name applied by the Sicherheitsdienst to a large Soviet espionage network, led by Leopold Trepper, which extended through much of Western Europe and was centered in Belgium and Germany before and during World War II. After the war, the Central Intelligence Agency devoted considerable resources to studying the Rote Kapelle and one major report, written by Dan Pinkus, was declassified in 1979. Further work, based on the network’s intercepted wireless traffic, was undertaken by Jim Olsen for the CIA’s Counterintelligence Staff.