 Roessler allegedly was the conduit the British used to transmit the results of their codebreaking of German cipher traffic (operation Ultra) to the Soviets without revealing their ability to read this German code.At the end of 1942, Abwehr and Gestapo caught up with the “Rote Kapelle”, Leopold Trepper's network.There had been some contacts between both spy rings in 1940, through Anatoly Gurevich (alias "Kent"), a Soviet undercover intelligence officer and so Radó's network became known to the Germans.