Parallel to his studies he was secretary of the Commission of Public Work, guide teacher in the National School of the Capital, Fiscal Agent in civil matters.

On June 19, 1930, he presented an initiative that tended to the abolition of the article in the Civil Code that allowed the “pact of resale” because he said it caused harm to the private property of the weakest economical classes.

On July 12, 1947, he was appointed as President of the Supreme Court of Justice after the death of Juan León Mallorquín.

that Juan Manuel Frutos governed like a “karai a lo yma” (an old fashion true gentleman), a president like it would never be seen again in the country.

The Legislative Assembly gathered and appointed Juan Manuel as successor of President Higinio Morínigo, after his government was overthrown because there was speculation that he might want to prolong his term of office with the support of arms.

Juan Manuel assumed the presidency on June 3, 1948, and held the position until August 15, 1948, when he gave it to Natalicio González.

During his government he declared August 16 “Day of the Paraguayan Children”, something that was proposed for Professor Andrés Aguirre, who was Director of Information for the Presidency in that moment.

Other matters of importance during his period of time were the “Legal Regimen of Intellectual Property” and the creation of the “National Culture Institute”.