 In 1923, Dobrescu was part of the defense for Constantin Titel Petrescu, leader of the Federation of Romanian Socialist Parties, during a trial for alleged insults addressed to the Romanian Army; Petrescu was eventually acquitted.Earlier in the year, Dobrescu had joined Petrescu's "Liga Drepturilor Omului" (League for Human Rights), which voiced protests against measures taken by the National Liberal cabinet of Ion I. C. Brătianu; the League also included Constantin Rădulescu-Motru, Constantin Mille, Victor Eftimiu, Nicolae L. Lupu, Constantin Costa-Foru, Grigore Iunian, Radu D. Rosetti, and Virgil Madgearu.Dobrescu was a member of the Communal Council of the Sector III ("Blue") and, following 1926 local elections, he became the mayor of the sector as a candidate for the National Peasants' Party (PNŢ).