KLK Calling PTZ The Red Orchestra alternate title KLK To PTX The Red Band German KLK an PTX Die Rote Kapelle is a 1971 East German film about the history of the Red Orchestra espionage ring.
Writer Claus Kchenmeister and his wife Wera began conducting interviews with former members of the Red Orchestra during 1966. Claus, son of the executed organization member Walter Kchenmeister, intended to make a documentary about the activities of his father. When officials in the Ministry of State Securitys Department of Agitation heard of his project, he was granted full government support and access to previously undisclosed materials in the Ministrys archives. Rather than documentary, a fulllength feature film was commissioned.KLK Calling PTZ was distributed in fiftyeight copies, and sold 2,107,093 tickets in the first year after its release. ........
Source: Wikipedia