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The 2A system was a network of anti-Nazi groups around Oslo . The union also went beyond the various political directions, as some members had a conservative, others a communist background. Well-known members were Karl Armin Fürst, Øyvind Øwre, Trygve Høgberg, Sverre Ellingsen, Rolf Tjersland, Jan Skappel, Gunnar Sønsteby , Asbjørn Bryhn and Alvhild Hovland.