This chapter examines the Roman communists’ activity in the 45 Days between the 25 July 1943 palace coup against Mussolini and the German invasion on 8 September. The liberalisation period following Marshal Badoglio’s appointment allowed the formation of the political movements that would go on to shape the Resistance. This chapter explains how the Italian Communist Party’s ‘national-unity’ policy hardened it against the dissident Communist Movement of Italy, as the rival currents of Roman communism took on greater organisational definition.