The Leftwing Revolutionary Nationalist Movement was founded by Hernán Siles Zuazo, a leader leftist sector of the Nationalist Revolutionary Movement. He had earlier been Vice-President, had led a revolution and had been President ; he had been in exile in 1946–1951 and 1964–1978. In 1971, a leader of MNR Víctor Paz Estenssoro supported the far-Right coup triggered by Colonel Hugo Banzer Suárez, and the MNR became officially a member of the regime, along with the party's traditional enemy, the Bolivian Socialist Falange. Víctor Paz Estenssoro's entry into the pro-Hugo Banzer Popular Nationalist Front with the FSB provoked Hernán Siles Zuazo's formal exit from the party, to form the Nationalist Revolutionary Movement of the Left.
Values
The MNRI sought the establishment of a government "truly representative of workers and peasants"; an end to "fratricidal struggles"; the suppression of the drug trade, and the renegotiation of foreign debt.
The Democratic and Popular Union coalition government was increasingly dominated by the MNRI, with the Revolutionary Left Movement withdrawing its support from January 1983 to April 1984, and again from December 1984; the Communist Party of Bolivia withdrew its backing in November 1984. By 1985 the Hernán Siles Zuazo regime was opposed by the left, the army, the unions and the peasantry, and early elections revealed the extent of its unpopularity: the MNRI won only 8 seats, as against 57 won by the UDP in 1980, and the MNRI presidential candidate, Roberto Jordan Pando, won only 05.48% votes, coming fourth.
Splinter groups
A split in 1980 established the Leftwing Revolutionary Nationalist Movement - 1; a minor a peasant sector. When Hernán Siles Zuazo became President, splits in the Nationalist Revolutionary Movement of the Left were already very visible. At least three factions were identifiable: the “Palaciego”, which surrounded Hernán Siles Zuazo; the MNRI-Legalista, which in 1983 joined the opposition in National Congress; and the Leftwing Revolutionary Nationalist Movement - 20th Century, a group of technocrats. In the long run the Palaciego and Siglo XX factions prevailed.
Dispersal
Owing to Hernán Siles Zuazo's deteriorating health, the Leftwing Revolutionary Nationalist Movement gradually disappeared. Most of its militants joined other parties, mainly the Revolutionary Left Movement and Revolutionary Nationalist Movement.