eventually arrested and the group broken up by the spring of 1943. The second and more important "Red Orchestra" group was entirely separate and was a genuine German resistance group, not controlled by the NKVD (the Soviet intelligence agency and predecessor to the KGB). This group was led by Harro Schulze-Boysen, an intelligence officer at the Reich Air Ministry, and Arvid Harnack, an official in the Ministry of Economics, both self-identified communists but not apparently KPD members. The group however contained people of various beliefs and affiliations. It included the theatre producer Adam Kuckhoff, the author Günther Weisenborn, the journalist John Graudenz and the pianist Helmut Roloff. It thus conformed to the general pattern of German resistance groups of being drawn mainly from elite groups. The main activity of the group was collecting information about Nazi atrocities and distributing leaflets against Hitler rather than espionage. They passed what they had learned to foreign countries, through personal contacts with the U.S. embassy and, via a less direct connection, to the Soviet government. When Soviet agents tried to enlist this group in their service, Schulze-Boysen and Harnack refused, since they wanted to maintain their political independence. The group was revealed to the Gestapo in August 1942 by Johann Wenzel, a member of the Trepper group who also knew of the Schulze-Boysen group and who informed on them after being discovered and tortured for several weeks . Schulze-Boysen, Harnack and other members of the group were arrested and secretly executed. Meanwhile, another Communist resistance group was operating in Berlin, led by a Jewish electrician, Herbert Baum, and involving up to a hundred people. Until 1941, the group operated a study circle, but after the German attack on the Soviet Union a core group advanced to active resistance. In May 1942, the group staged an arson attack on an anti-Soviet propaganda display at the Lustgarten in central Berlin. The attack was poorly organised and most of the Baum group was arrested. Twenty were sentenced to death, while Baum himself "died in custody". This fiasco ended overt Communist resistance activities, although the KPD underground continued to operate, and re-emerged from hiding in the last days of the war. After Stalingrad At the end of 1942, Germany suffered a series of military defeats, the first at El Alamein, the second with the successful Allied landings in North Africa (Operation Torch), and the third the disastrous defeat