[5] It was on the moderate left, but its opponents claimed that during the early 1960s, the country's communists adopted a policy of entryism towards the PR, which was used as justification for the coup of Enrique Peralta Azurdia.

[6] Despite this the PR survived the coup and contested the 1966 general election, managing to gain the 50,000 members required by the military government in order to be allowed to run.

[8] The younger Montenegro brother was duly elected as President, but his promised reforms were implemented poorly as despite his repudiation of any alliance, the military remained too powerful a check on his ambitions.

[9] Francisco Villagrán Kramer became vice-president, hoping that the PR's entrance into a coalition with the pro-military party would provide a moderate counterweight but resigned in 1980 and left for the United States after disagreements within the government.

In 1985, the PR formed an alliance with the Democratic Party of National Conciliation and backed Jorge Serrano Elias in the presidential race.