World Disarmament Conference
Massigli was a prominent player at the World Disarmament Conference in Geneva and helped to write famous "Barthou note" of 17 April 1934 issued by the foreign minister, Louis Barthou, which helped to terminate the conference. Massigli was especially opposed to the prime minister, Édouard Herriot, who accepted in December 1932 "Gleichberechtigung""in principle", as Massigli correctly predicted that it would lead to opening the door for German rearmament.