Button made in France with PSU.
The Unified Socialist Party (French: Parti Socialiste Unifié, PSU) was a socialist political party in France, founded on April 3, 1960.
The PSU was born through the fusion of the Autonomous Socialist Party (PSA), the Socialist Left Union (UGS), and the group around the journal Tribune du Communisme. The latter was a splinter group of the French Communist Party (PCF), which had left after the 1956 inner conflict caused by the Soviet invasion of Hungary.
In 1989, PSU merged with the New Left for Socialism, Ecology and Self-management (Juquin's movement), and formed the Red and Green Alternatives (nowadays integrated in the group Les Alternatifs).