His father, a workman, had taken up arms alongside the Republican faction in the International Brigades during the Spanish Civil War, while his mother was a childcare staffer at a school.
[2] As a member of the Foreign Affairs Committee across three sittings of French Parliament ("législatures"), he took part in many international negotiations and busied himself with many matters.
Thanks to his prerogatives within the Foreign Affairs Committee, he was able to recover part of the International Brigades' archives that had been deposited in Moscow.
Noting the absence of parliamentary control over the executive's various international activities, he sought to establish a delegation in Parliament that would be in charge of such issues.
He reminded the Socialist minister of his own emigration from Spain to flee Francisco Franco's régime, and compared it to the Romani people's situation, suffering discrimination in their countries of origin.
[11] Lefort quit the French Communist Party on 19 January 2024 "with great pain" following a dispute with his secretary general, Fabien Roussel over the Israel–Hamas war.
[12] The ceremony was held on 7 December 2011, at which Lefort was decorated by Cécile Rol-Tanguy, herself Commander of the Legion of Honour and a recipient of the Resistance Medal, in the presence of the Ambassador of Palestine to France, Hael Al Fahoum, and Pierre Gosnat.