Ventotene Manifesto
In June 1941, well before the outcome of the war was safely predictable, Spinelli and fellow prisoner Ernesto Rossi completed the Ventotene Manifesto, eventually entitled Per un’Europa libera e unita ("Toward a Free and United Europe"), which argued that, if the fight against the fascist powers was successful, it would be in vain if it merely led to the re-establishment of the old European system of sovereign nation-states in shifting alliances. This would inevitably lead to war again. The document called for the establishment of a European federation by the democratic powers after the war. Because of a need for secrecy and a lack of proper materials at the time, the Manifesto was written on cigarette papers, concealed in the false bottom of a tin box and smuggled to the mainland by Ursula Hirschmann. It was then circulated through the Italian Resistance, and was later adopted as the programme of the Movimento Federalista Europeo, which Spinelli, Rossi and some 20 others established, as soon as they were able to leave their internment camp. The founding meeting was held in clandestinity in Milan on the 27/28 August 1943.
The Manifesto was widely circulated in other resistance movements towards the end of the war. Resistance leaders from several countries met clandestinely in Geneva in 1944, a meeting attended by Spinelli.
The Manifesto put forward proposals for creating a European federation of states, the primary aim of which was to tie European countries so closely together that they would no longer be able to go to war with one another. As in many European left-wing political circles, this sort of move towards federalist ideas was argued as a reaction to the destructive excesses of nationalism. The ideological underpinnings for a united Europe can thus be traced to the hostility of nationalism: "If a post war order is established in which each State retains its complete national sovereignty, the basis for a Third World War would still exist even after the Nazi attempt to establish the domination of the German race in Europe has been frustrated" (founding meeting of the MFE).
Read more about this topic: Altiero Spinelli