In the autumn of 1907 he enrolled in the engineering course at the Polytechnic University of Turin, giving private mathematics lessons to support himself in his studies.

At the FIGS congress on 18 October 1910, Romita joined the national council embracing the anti-monarchical and republican theses.

He was secretary of the PSI section of Turin in 1911, increasing his political involvement and at the same time managing to graduate in engineering at the Polytechnic in 1913.

He returned to the secretariat of the Turin section of the PSI following the arrest of the previous secretary and therefore participated in the "bread revolt" of August 1917, ending up in jail until April 1918.

During the XXVII legislature of the Kingdom, Romita participated in the Aventine Secession and experienced the slow decline of the parliamentary mandate during the course of 1925.

The day after the fateful 8 September 1943 the National Liberation Committee was formed, in which Romita together with Nenni was called to represent the PSIUP.

Romita left the PSI in June 1949, and in December of that year he founded the Unitary Socialist Party (PSU).