L Legislature of the Mexican Congress#Main accomplishments

The composition of the 50th Congress was as follows:

{{Main|Senate of the Republic (Mexico)}}

Two members were elected to the Senate from each state and the Federal District, giving a total of 64 senators. For the first time in history a senator was elected who did not belong to the Institutional Revolutionary Party (PRI). Jorge Cruickshank García had been nominated by the PPS; the PRI did not lose this seat, however, because it formed an electoral alliance with the winning party. Thus this senator posed no opposition to the PRI or the government during his term.

The 64 Senators forming the L Legislature were the following:

{{Main|Chamber of Deputies (Mexico)}}

For this legislative session, the Chamber of Deputies was composed of a total of 237 deputies, of whom 196 were elected by majority vote in each constituency and 41 more were deputies by party. These were allocated in proportion to the votes that the non-winning parties obtained in the districts.

The composition of the Chamber of Deputies during the 50th session of Congress was as follows:

• 1976–1977: Augusto Gómez Villanueva File:PRI Party (Mexico).svg
• 1977–1979: Rodolfo González Guevara File:PRI Party (Mexico).svg
• 1979: Antonio Riva Palacio López File:PRI Party (Mexico).svg

It was the 50th Congress that, in 1977, adopted the first political reforms to occur in Mexico. This reform, negotiated by Secretary of the Interior Jesús Reyes Heroles, included legal recognition of political organizations from the left, traditionally marginalized and pushed into armed struggle, especially after the events of 1968 and which degenerated into a "Dirty War" during the 1970s.{{Cite web |url=http://www2.kenyon.edu/Depts/PSci/Fac/klesner/Electoral_Reform_in_Mexico.htm |title=Electoral reform in Mexico's hegemonic party system: Perpetuation of privilege or democratic advance? |first=Joseph L. |last=Klesner |date=28–31 August 1997 |accessdate=31 May 2013}}

Legal reform, known formally as the Ley de Organizaciones Políticas y Procedimientos Electorales (LOPPE) (Law of Political Organizations and Electoral Procedures), defined and made possible procedures for the registration of new political parties (in 1977 legally there were only the PRI, the National Action Party (PAN), the Popular Socialist Party (PPS) and the Authentic Party of the Mexican Revolution (PARM)).{{Cite web |url=http://www.sscnet.ucla.edu/soc/groups/scr/martinez.pdf |archive-url=https://web.archive.org/web/20000930125056/http://www.sscnet.ucla.edu/soc/groups/scr/martinez.pdf |url-status=dead |archive-date=September 30, 2000 |title=Changing campaign strategies in Mexico: The effects of electoral reforms on political parties |first= Sarah |last=Martinez |date=May 8–9, 1999 |accessdate=1 June 2013}} This allowed for the registration, for the first time in 40 years, of the Mexican Communist Party, which was followed by the National Assembly of the Socialist Left, the Mexican Democratic Party and the Social Democratic Party.

In addition, the LOPPE increased the size of the Chamber of Deputies, increasing the number of single-member districts from 196 to 300 and establishing deputies by proportional representation, replacing the previous deputies by party. There were initially 100 such positions, resulting in the Chamber of Deputies comprising 400 deputies.{{cite journal |title=Evolución territorial de los distritos electorales federales uninominales, 1977–2010 |last1=Baños Martínez |first1=Marco Antonio |last2=Palacios Mora |first2=Celia |trans-title=Territorial evolution of the federal uninominal electoral districts, 1977–2010 |journal=Investigaciones Geográficas |publisher=Instituto de Geografía, UNAM |place=Mexico City |date=2014 |issue=84 |page=92 |doi=10.14350/rig.34063 |url=https://www.investigacionesgeograficas.unam.mx/index.php/rig/article/view/34063/39223 |access-date=3 July 2024}}

• Congress of the Union
• Mexico Chamber of Deputies
• Senate of the Republic (Mexico)

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{{Reflist}}

• [https://web.archive.org/web/20130430193056/http://camaradediputados.gob.mx/ Official page of the Chamber of Deputies]
• [http://www.senado.gob.mx Official page of the senate]

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