Secretariat of the Interior in the context of National Intelligence Centre (Mexico)

Plutarco Elías Calles (born Francisco Plutarco Elías Campuzano; 25 September 1877 – 19 October 1945) was a Mexican politician and military officer who served as the 47th President of Mexico from 1924 to 1928. After the assassination of Álvaro Obregón, Calles founded the Institutional Revolutionary Party and held unofficial power as Mexico's de facto leader from 1929 to 1934, a period known as the Maximato. Previously, he served as a general in the Constitutional Army, as Governor of Sonora, Secretary of War, and Secretary of the Interior. During the Maximato, he served as Secretariat of Public Education, Secretary of War again, and Secretary of the Economy. During his presidency, he implemented many left-wing populist and secularist reforms, opposition to which sparked the Cristero War.

Born on 25 September 1877 in Sonora, Calles fought in Venustiano Carranza's Constitutional Army during the Mexican Revolution, which allowed him to rise in politics, joining the cabinets of Presidents Carranza, Adolfo de la Huerta, and Álvaro Obregón. Obregón selected him as the Laborist Party's candidate in the 1924 election. His campaign was the first populist presidential campaign in Mexico's history, as he called for land redistribution and promised equal justice, further labor rights, and democratic governance. He won the election and expanded education, implemented infrastructure projects, and improved public health. After this populist phase (1924–1926) he began to persecute the Catholic Church in Mexico (1926–1928), passing several anticlerical laws that resulted in the Cristero War. He allowed CROM's Luis N. Morones to consolidate unions under the Laborist Party, and launched a failed attempt to cancel the Bucareli Treaty. Obregón still held significant political sway and was Calles's main base of support.

Luis Echeverría Álvarez (Spanish pronunciation: [ˈlwis etʃeβeˈri.a ˈalβaɾes]; 17 January 1922 – 8 July 2022) was a Mexican lawyer, academic, and politician affiliated with the Institutional Revolutionary Party (PRI) who served as the 57th president of Mexico from 1970 to 1976. Previously, Echeverría was Secretary of the Interior from 1963 to 1969. He was the longest-lived president in Mexican history and the first to reach the age of 100.

Echeverría was a long-time CIA asset, known by the cryptonym, LITEMPO-8. His tenure as Secretary of the Interior during the Díaz Ordaz administration was marked by an increase in political repression. Dissident journalists, politicians, and activists were subjected to censorship, arbitrary arrests, torture, and extrajudicial killings. This culminated with the Tlatelolco massacre of 2 October 1968, which ruptured the Mexican student movement; Díaz Ordaz, Echeverría, and Secretary of Defense Marcelino Garcia Barragán have been considered as the intellectual authors of the massacre, in which hundreds of unarmed protestors were killed by the Mexican Army. The following year, Díaz Ordaz appointed Echeverría as his designated successor to the presidency, and he won in the 1970 general election.

Adolfo Tomás Ruiz Cortines (Spanish pronunciation: [aˈðolfo ˈrwis koɾˈtines] 30 December 1889 – 3 December 1973) was a Mexican politician who served as President of Mexico from 1952 to 1958. A member of the Institutional Revolutionary Party (PRI), he previously served as Governor of Veracruz and Secretary of the Interior. During his presidency, which constituted the Mexican Miracle, women gained the right to vote, and he instituted numerous public health, education, infrastructure, and works projects.

A member of the Constitutional Army, Ruiz Cortines was the last Mexican president to have fought in the Mexican Revolution. He worked at the Ministry of Industry and Commerce during the administration of Adolfo de la Huerta and served as an official in the Department of Statistics from 1921 to 1935. Ruiz Cortines joined the Institutional Revolutionary Party and became Senior Official of the Government of the Federal District in 1935 and member of the Chamber of Deputies for Veracruz in 1937. In 1939 he was appointed treasurer of the presidential campaign of Manuel Ávila Camacho and worked as Governor of Veracruz from 1944 to 1948, a position he left to become Secretariat of the Interior during the administration of Miguel Alemán Valdés.