Valentín Campa, a well-known union leader and figurehead of the outlawed Mexican Communist Party, ran as an unregistered candidate and received nearly a million votes that had to be annulled.
The September 23 Communist League, the Party of the Poor and the Movimiento de Acción Revolucionaria [es] were among the urban and rural subversive groups whose members were tortured and imprisoned during the 1970s dirty war.
A year later, an amnesty law was pushed, fulfilling a leftist demand that this package of reforms lay the groundwork for the end of political clandestinity by creating democratic channels.
[4] On 1 April 1977 Minister of the Interior Jesús Reyes Heroles made a speech in Chilpancingo in which he declared his intention to make significant modifications to the electoral system.
The choice of this city for the announcement was intentional, as it was the seat of the organization from which the majority of armed and peasant movements against the government, including those led by Genaro Vázquez and Lucio Cabañas, had emerged.