In 1924 and in 1932, the Socialists joined with the Radicals in the Coalition of the Left (Cartel des Gauches), but refused to join the non-Socialist governments led by the Radicals Édouard Herriot and Édouard Daladier. These governments failed because the Socialists and the Radicals could not agree on economic policy, and also because the Communists, following the policy laid down by the Soviet Union, refused to support governments presiding over capitalist economies. The question of the possibility of a government participation with Radicals caused the split of "neosocialists" at the beginning of the 1930s. They merged with the Republican-Socialist Party in the Socialist Republican Union.
