[1] A veteran of the nationalist political scene, he was first associated with the National Socialist Movement of Chile or Nacistas, albeit as a low level member.

[1] During the late 1940s he led his own group, the Estanqueros, based around corporatism and strong support for the regimes of Francisco Franco and António de Oliveira Salazar as well as militant anti-communism.

It sought the creation of a highly disciplined hierarchy in society and government with a strong charismatic leader and an elite ruling class in an ideology that Prat called current portalismo after Diego Portales.

As Minister Prat endorsed an austerity programme with higher taxes and the suspension of the right to strike, leading to severe opposition from the National Congress of Chile.

Prat then attempted to run for President of Chile in the 1964 election and to this end formed his own party, the National Action, with Sergio Onofre Jarpa in 1963.