Title: Contraespionaje político y sucesión presidencial
Subjects: Correspondence, Election, Intelligence service, Political aspects of Telecommunication, Politics and government, Presidents, Telecommunication, Political aspects
Places: Mexico
People: Alvaro Matute, Alvaro Obregón (1880-1928), Trinidad W. Flores, Venustiano Carranza (1859-1920)
Time periods: 1910-1946