Léon Deffontaines was born on 15 March 1996.[1] He is the son of a florist and a psychologist and comes from a family of farmers.[2][3] In 2013, he joined the Young Communist Movement of France. In 2014, when he was 18 years old and a high school student in his economic and social final year, he was a candidate for the 2014 municipal elections in Amiens.[1][4]
Deffontaines began studying law and political science, as well as education, and took on multiple odd jobs. He was then a member of a homework help association for young people in difficulty in sensitive areas of the city of Amiens and intended to become a teacher.[5]
His first years of communist activism were marked by the struggle of employees at the Goodyear site in Amiens, whose closure in 2014 led to the dismissal of more than 1,100 people, and the mobilizations against the reforms of François Hollande.[6] He was elected federal secretary of the Young Communist Movement in the Somme in 2016, and was then elected general secretary in 2019 and stayed at this position until June 2023.[3][7]
