After the liberation of Florence Pieraccini was made the councilor of the first democratic administration and worked as the director of a socialist weekly entitled
La defense. He was editor of the newspaper of the Resistance forces entitled
La Nazione del Popolo and co-director of another newspaper,
Il Nuovo corriere. Pieraccini was a deputy from 1948 to 1968. He was part of the group which assumed the leadership of the Italian Socialist Party and director of the newspaper
Avanti! from 1960 to 1963. In the late 1960s Pieraccini was part of the right-wing group in the party together with
Pietro Nenni and
Mario Zagari.{{cite journal|author=Ilaria Favretto|title=The Wilson Governments and the Italian Centre-Left Coalitions: Between 'Socialist' Diplomacy and Realpolitik, 1964–70 |journal=European History Quarterly Following his retirement from politics in 1974{{cite news|title=Viareggio: morto Giovanni Pieraccini, ministro dei Lavori pubblici nel primo governo Moro|access-date=15 January 2022|work=La Repubblica|language=it ==Death==