 Marcel Bloch was imprisoned by the Vichy government in October 1940.In 1944 Bloch was deported to the Buchenwald concentration camp by the German occupiers where he remained until it was liberated on 11 April 1945.On 10 November 1945, at an extraordinary general meeting of the "Société Anonyme des Avions Marcel Bloch" the company voted to change its form to a limited liability entity, "Société des Avions Marcel Bloch", which was to be a holding company.