LI Legislature of the Mexican Congress

The LI Legislature of the Congress of the Union was the 51st session of the Congress of Mexico. It sat from 1 September 1979 to 31 August 1982.
The session's senators had been elected in the 1976 general election while the deputies were elected in the 1979 mid-term election.
It marked a watershed in that it was the first congress elected after the 1977 political reforms, under which several parties on the left and the right obtained official registration and access to Congress by opposition parties was made much more viable. The session's members included the first deputies from the Mexican Communist Party, the Workers' Socialist Party and the Mexican Democratic Party. The reforms also increased the number of deputies: 300 from single-member constituencies and 100 from regional lists.

Senate

The 1976 general election had elected two senators for each state and the Federal District – a total of 64 – to serve six-year terms. They were in office for the 50th and 51st sessions of Congress.

Chamber of Deputies

The 51st Congress was elected in the July 1979 mid-term election following the 1977 political reforms: the number of single-member constituencies was increased to 300, the proportional representation system was expanded to 100 seats, and three parties obtained their first deputies: the Mexican Communist Party, the Workers' Socialist Party and the Mexican Democratic Party.

Proportional representation deputies

For the 1979 election, 100 proportional representation deputies were elected from three electoral regions. Regions 1 and 2 elected 30 seats, while No. 3 was assigned 40.

1st region: Aguascalientes, Baja California, Baja California Sur, Colima, Guanajuato, Guerrero, Jalisco, Michoacán, Nayarit, Sinaloa and Sonora
2nd region: Chihuahua, Coahuila, Durango, Hidalgo, Nuevo León, Querétaro, San Luis Potosí, Tamaulipas, Veracruz and Zacatecas
3rd region: Campeche, Chiapas, Federal District, State of Mexico, Morelos, Oaxaca, Puebla, Quintana Roo, Tabasco, Tlaxcala and Yucatán

Region	Deputy	Party	Region	Deputy	Party
First	Luis Calderón Vega		Second	Juan Manuel Lucía Escalera
First	David Alarcón Zaragoza		Second	Gumersindo Magaña
First	Rafael Morelos Valdés		Second	Adelaida Márquez Ortiz
First	Carlos Pineda Flores		Second	Valentín Campa
First	Antonio Obregón Padilla		Second	Carlos Sánchez Cárdenas
First	Rafael Morgan Álvarez		Second	Antonio Becerra Gaytán
First	Juan Manuel López Sanabria		Second	Santiago Fierro Fierro
First	Alberto Petersen Biester		Second	Pedro Etienne Llano
First	Salvador Morales Muñoz		Second	Juan Manuel Elizondo C.
First	Esteban Zamora Camacho		Second	Juan Manuel Rodríguez G.
First	Cecilia Martha Piñón Reyna		Third	Abel Vicencio Tovar
First	Delfino Parra Banderas		Third	Eugenio Ortiz Walls
First	Ezequiel Rodríguez Arcos		Third	David Bravo y Cid de León
First	Martín Tavira Urióstegui		Third	Armando Ávila Sotomayor
First	Ernesto Rivera Herrera		Third	Luis Castañeda Guzmán
First	Antonio Gómez Velazco		Third	Juan Landerreche Obregón
First	Enrique Peña Vázquez		Third	Francisco Xavier Aponte
First	Ramiro Lupercio Medina		Third	Carlos Castillo Peraza
First	Roberto Picón Robledo		Third	Raúl Velazco Zimbrón
First	Luis Uribe García		Third	Hiram Escudero Álvarez
First	Luis Cárdenas Murillo		Third	Graciela Aceves Pérez
First	Felipe Pérez Gutiérrez		Third	Federico Ling Altamirano
First	Alejandro Gascón Mercado		Third	José Isaac Jiménez Velazco
First	Roberto Jaramillo Flores		Third	José G. Minondo Garfias
First	Ramón Danzós Palomino		Third	Miguel Martínez Martínez
First	Othón Salazar		Third	Lázaro Rubio Félix
First	Sabino Hernández Téllez		Third	Amado Tame Schear
First	Jorge Amador Amador		Third	Humberto Pliego Arenas
First	Adolfo Mejía González		Third	Cuauhtémoc Amezcua Dromundo
First	Loreto Hugo Amao González		Third	Gilberto Velázquez Sánchez
Second	Pablo Emilio Madero		Third	Antonio Vázquez del Mercado
Second	Edmundo Gurza Villarreal		Third	Ricardo Flores Magón
Second	María del Carmen Jiménez Méndez		Third	Jesús Guzmán Rubio
Second	Juan de Dios Castro Lozano		Third	Juan Aguilera Azpeitia
Second	Francisco Ugalde Álvarez		Third	Ernesto Guzmán Gómez
Second	Jesús González Schmal		Third	Miguel José Valadéz Montoya
Second	Manuel Rivera del Campo		Third	José Valencia González
Second	Rafael Alonso y Prieto		Third	Arnoldo Martínez Verdugo
Second	Augusto Sánchez Losada		Third	Gilberto Rincón Gallardo
Second	Esteban Aguilar Jáquez		Third	Manuel Stephens García
Second	Carlos Stephano Sierra		Third	Gerardo Unzueta Lorenzana
Second	Álvaro Elías Loredo		Third	Evaristo Pérez Arreola
Second	Hildebrando Gaytán Márquez		Third	Manuel Arturo Salcido Beltrán
Second	Benito Hernández García		Third	Pablo Gómez Álvarez
Second	Belisario Aguilar Olvera		Third	Fernando Peraza Medina
Second	Rafael Carranza Hernández		Third	Juventino Sánchez Jiménez
Second	Carlos Cantú Rosas		Third	Graco Ramírez
Second	Horacio Treviño Valdez		Third	Manuel Terrazas Guerrero
Second	Luis Alberto Gómez Grajales		Third	América Abaroa Zamora
Second	Rodolfo Delgado Severino		Third	Jesús Ortega Martínez