Finally, someone asks a question that deals with EXACTLY what I specialize in (haha, sorry):

So, right-wing Peronists were not persecuted in Argentina in the 1970s and 1980s, or at least not to the extent that left-wing Peronists were targeted. This was because of mainstream Peronism's turn to the right after Juan Perón's death in 1974 and his first lady/vice president Isabel de Perón's support for groups like the Alianza Anticomunista Argentina (AAA) in their struggles against leftist groups. The right-wing Peronist government under Isabel de Perón extensively collaborated with the military over the course of two years in their efforts to "neutralize" or "annihilate" the perceived subversive threats like the Peronist-Marxist Montoneros active in the eastern, coastal cities, but also the non-Peronist but still Marxist Ejército Revolucionario del Pueblo (Revolutionary Peoples' Army, or ERP) active in Tucumán. Even though Isabel de Perón's government and the military establishment shared the goal of opposition to left-wing Peronism and leftism in general, the military overthrew the civilian government in 1976 because of what they saw as corruption and economic mismanagement rather than ideological differences. The AAA during this time was actually absorbed by the military because of its leadership's connections with the military hierarchy. The right wing of Peronism actually maintained dominance over the party until the 2003 advent of Néstor Kirchner.

So, in short, even though the military government was predominantly anti-Peronist, right-wing Peronist groups like the AAA remained relatively safe from state-sponsored repression because of their anticommunism. Even though it does not focus specifically on the AAA or Peronism as a whole, Raanan Rein's Argentine Jews or Jewish Argentines provides a very good, comprehensive overview of the political situation in 1970s Argentina, and I would recommend it for further reading. I would also recommend Ideological Origins of the Dirty War by Federico Finchelstein and various works by Gabriela Águila and James Brennan for works about the Dirty War and the evolution of Peronism, among other topics.