European Movement International (EM) was founded in October 1948 after the Hague Congress held in May to coordinate the initiatives of the major European movements and political forces in favour of the unification of the Old Continent. The aim of this essay is to analyse EM’s stance in defence of the Community institutions established under the Treaties of Paris (1951) and Rome (1957), in the face of the so-called “empty chair crisis”. This crisis between the French government and the other Community partners was triggered by proposals made in March 1965 by the Commission of the European Economic Community, chaired by Walter Hallstein, which established a direct relationship between the renewal of the financial regulation of the Common Agricultural Policy, the shift towards a system of “own resources” (from agricultural levies and customs duties) and the strengthening of the European Parliament’s powers.