Pio had become interested in socialism through his reading of Danish folk literature, which often depicted the oppressed joining together to oppose their oppressors. But it was not until 1871, when news of the
Paris Commune swept Europe, that he established contact with formal socialist movements. In that year, he resigned from the Danish postal service, and began a written correspondence with the German-speaking branch of the
Socialist International in
Geneva, as well as meeting like-minded socialists in Copenhagen. Together with Harald Brix and
Poul Geleff, he labored to set up a Danish section of the
Socialist International, following the English model of setting up trade unions. During the day, Pio worked as a tutor for a wealthy bourgeois family, and during the evenings he wrote for
Socialisten, Brix's new weekly newspaper whose first edition was published on 21 May 1871. The paper was very successful, and Pio became the main writer for its articles as well as the main theoretician for the group of socialists. His leadership was controversial since other Danish socialists considered his style somewhat dictatorial, but he established good contacts with socialist movements elsewhere in Europe, maintaining an extensive correspondence with other socialist leaders, much of which survives today. They settled at
Smoky Hill River, Kansas, where he founded a socialist colony. This soon failed because of the lack of agricultural expertise among the colonists. He moved to
Chicago, Illinois, where he lived in poverty, working at odd jobs. In 1878, he founded
Den Nye Tid, a Danish- and Norwegian-language socialist newspaper, which he edited for only a few months. It was in operation until 1884. Pio died on 27 June 1894. ==References==