He allied himself with the centrist Radical Civic Union (UCR) early on, though after the rise of populist leader Juan Perón in 1945, he switched allegiances for the latter.

The party's leader, President Perón, ordered Saadi removed from his post after four months, however, amid allegations of "nepotism and despotism" in his administration of the remote province.

In the 1970s Saadi had been a leading supporter of the far-left Montoneros, and set up the Intransigencia y Movilización faction; he was a patron of future Defense Minister Nilda Garré.

Saadi abandoned his earlier support for left-wing Peronists, and endorsed Herminio Iglesias as candidate in the race for Governor of Buenos Aires (the nation's largest province).

[2] Saadi later took part in a famous television debate with Dante Caputo on November 14, 1984, arguing against the Treaty of Peace and Friendship of 1984 between Chile and Argentina.