In 1934 , the Communists changed their line , and the four left-wing parties came together in the Popular Front , which won the 1936 elections and brought Blum to power as France 's first SFIO Prime Minister .
In 1934 , the Communists changed their line , and the three parties came together in the Popular Front , which won the 1936 elections and brought Blum to power as France 's first Socialist Prime Minister .