"One wing of the party under it's leader Leon Blum saw early on that the new German Chancellor whose thugs had been smashing windows and brawling in the street for years was a potential threat and argued that France had to get ready to do something about him, the other wing argued against viewing Hitler in black and white terms. They had a more nuanced view of Herr Hitler. The latter faction were so eager to avoid another war that they ended up sabotaging France's ability to fight. It won't surprise those familiar with French history that a number of the anti-war Socialists ended up in the collaborationist Vichy Regime under German occupation. Or that Leon Blum ended up in Dachau."
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