European Federalist Movement
The European Federalist Movement (Movimento Federalista Europeo, MFE) was founded in Milan in 1943 by a group of activists led by Altiero Spinelli. The principles which inspired its foundation are contained in the Ventotene Manifesto, drawn up in 1941 by Spinelli himself, Eugenio Colorni, Ursula Hirschmann and Ernesto Rossi, and circulated by the in May 1943 circulated L'Unità europea periodical.
Source: Wikipedia — European Federalist Movement (CC BY-SA 4.0)