Many countries considered communism as the most important threat. Security services of neutral countries like the Netherlands, Switzerland and Belgium attended conferences with other nations, including Nazi Germany, to consider their position towards communism. Such a conference took place in Berlin from 30 August until 3 September 1937. De Foy attended only at the end. He was rather reserved about such meetings, and reduced his own participation to a minimum. After the war he declared to an investigating magistrate and to a journalist of the Associated Press that there had never been deals made between the Gestapo and the Belgian police services for a joint battle against communism.