Léon Blum was a French politician and a prominent leader of the French Socialist Party. Born on April 9, 1872, he became the first socialist Prime Minister of France, serving three terms in the 1930s. Blum is best known for his role in the Popular Front, a coalition of leftist parties that implemented social reforms, including the 40-hour workweek and paid vacations. Blum's political career was marked by his opposition to fascism and his support for democracy. He was also a key figure during the Dreyfus Affair, advocating for justice and civil rights. His legacy continues to influence socialist movements in France and beyond.