 During the summer of 1936, Shulze-Boysen had become preoccupied by the Popular Front in Spain and through his position at the Reich Aviation Ministry and had collected detailed information of the support that Germany was providing to the group.The documents were passed to the "Antimilitarist Apparatus" or AM Apparat (Intelligence organisation) of the German Communist Party.At the end of 1936, Libertas Schulze-Boysen and Walter Küchenmeister, on the advice of Elisabeth Schumacher wife of Kurt Schumacher, sought out Elfriede Paul, a doctor, who would become a core member of the group.