Rudolf Walter Voigt, _alias_ Walter Clas, _alias_ Heinz Leonhard, _alias_ Herbert Frank--names which he used throughout Europe in his espionage work will serve as an illustration. Voigt was sent to Prague on a delicate mission. His job was to discover how Czechs got to Spain to fight in the International Brigade, a mystery in Berlin since such Czechs had to cross Italy, Germany or other fascist countries which cooperate with the Gestapo. Voigt was given passport No. 1,128,236 made out in the name of Walter Clas, and bearing at the top of the passport the letters and numbers 1A1444. He was instructed, by Leader Wilhelm May of Dresden, to report to the Henlein Party headquarters upon his arrival in Prague. Clas, _alias_ Voigt, arrived October 23, 1937, reported at the Sudeten Party headquarters and saw a man whom I was unable to identify. He was instructed to report again four days later, since information about the agent had not yet arrived. Voigt was trained in the Gestapo espionage schools in Potsdam and Calmuth-Remagen. He operates directly under Wilhelm May whose headquarters are in Dresden. May is in charge of Gestapo work over Sector No. 2. Preceding the granting to Hitler of the Sudeten areas in Czechoslovakia, the entire Czech border espionage and terrorist activity was divided into sectors. At this writing the same sector divisions still exist, operating now across the new frontiers. Sector No. 1 embraces Silesia with headquarters at Breslau; No. 2, Saxony, with headquarters at Dresden; and No. 3, Bavaria, with headquarters at Munich. After the annexation of Austria, Sector No. 4 was added, commanded by Gestapo Chief Scheffler whose headquarters are in Berlin with a branch in Vienna. Sector No. 4 also directs _Standarte II_ which stands ready to provide incidents to justify German invasion "because the situation has got out of control of the local authorities." Another way in which immigration authorities, especially in countries surrounding Germany, can detect Gestapo agents is by the position of stamps on the German passport. Stamps are placed, in accordance with German law, directly under the spot provided for them on the passport on the front page, upper right hand corner. Whenever the stamps are on the cover facing the passport title page, it is a sign to Gestapo representatives and Consulates that the bearer is an agent who crossed the border hurriedly without time to get the regular numbers and letters from Gestapo headquarters. The agent is given this means of temporary identification by the border Gestapo chief.