[23] Orthodox Peronism also referred to the Peronist trade union faction that split from the “62 organizations" and that opposed the “legalists", who were more moderate and pragmatic.

"[27] According to Donald C. Hodges, "three forces contended for Peron's ear during his third government and for his mantle after he died: montonerismo on the Left, lopezreguismo on the Right, and vandorismo in the Center."

Montoneros refused to ally themselves with the vandorist trade unions in order to isolate López, seeing their relationship with the labor bureaucracy as antagonistic instead.

[28] Orthodox Peronism from this point onward came to represent the factions that, in the name of verticalism, opposed any alignment with Marxism or the Peronist left.

During Raúl Lastiri’s interim presidency and after Perón’s death, this new orthodox coalition used both institutional and extralegal means to push out and marginalize the left-wing heterodoxy, which included leftist Peronists and their aligned governors and officials.

[29] This led to increased political violence within the Peronist movement, further aggravated by armed guerrilla activities, marking one of the most violent periods in Argentina’s history.

This prompted Isabel to declare a "state of siege" against the protests and clashes, though she did not outlaw the Montoneros or ban the trade union militias.

Isabel-López administration clashed not only with Peronist-socialist guerillas, but also with "students, left-leaning intellectuals and artists, trade union leaders, journalists, lawyers".

[3][31][32] It also opposed Perón's ideological declaration from the 1970s, such as his Peronism "is one form of socialism",[33] and that "Marxism is not only not in contradiction with the Peronist Movement, but complements it".

The distinction of the orthodox organizations of "far right" obeys to that these last ones assumed the fight against the Marxist advance within the Peronist movement through the armed violence, with a marked antisemitic, anticommunist and antisynarchist bias.

[41] Others scholars dispute the fascist nature of Orthodox Peronism - Hodges argues that unlike military regimes in Chile or Brazil, Orthodox Peronism continued to favor a policy of aligning with the Third World, represented a social pact of nationalist sectors with organized labor rather than being "intent on destroying the labor movement through an alliance with imperialism", and had more in common with the "Mexican model of authoritative democracy than with the military repressive regimes in Latin America".

[42] Likewise, Goran Petrovic Lotina and Théo Aiolfi wrote that "Peronism was never a form of fascism during Juan Perón's first presidencies (1946-55).

Nor was Peronism fascistic in its subsequent incarnations over the past seventy-five years from the 1970s revolutionary leftist Montonero guerilla organization to the neoliberal centre-right presidency of Carlos Menem.

The Alianza Anticomunista Argentina (AAA) also Is included, although it is not yet clear if it is its own political organization, a mere death squad, or a confederation of right-wing groups.