Red Orchestra (espionage)
The Red Orchestra (German: Rote Kapelle, pronounced [ˈʁoːtə kaˈpɛlə] ) was the name given by the Abwehr Section III.F to anti-Nazi resistance workers in Germany in August 1941. It primarily referred to a loose network of resistance groups, connected through personal contacts, uniting hundreds of opponents of the Nazi regime.
Source: Wikipedia — Red Orchestra (espionage) (CC BY-SA 4.0)