It was formed on December 21, 1930, by
leftists expelled from the
French Communist Party (PCF), together with some who had previously belonged to the left wing of the
Section française de l'Internationale ouvrière (SFIO). Its members were known in France as
pupistes, and one of its notable leaders was
Alexandre Bachelet. At one time, the party held ten seats in the
Chamber of Deputies of the
Third Republic. The PUP affiliated to the
London Bureau of left-socialist parties. On January 31, 1937, it voted to rejoin the SFIO. Many of the top members of the PUP subsequently were involved with
collaboration with the Axis powers during the
Vichy regime. == External links ==