The Popular Front policy of the Comintern was introduced in 1934, succeeding its ultra-left "Third Period" during which it condemned non-Communist socialist parties as "social fascist". The new policy was signalled in a Pravda article of May 1934, which commented favourably on socialist-Communist collaboration.[3] In June 1934, Léon Blum's Socialist Party signed a pact of united action with the French Communist Party, extended to the Radical Party in October.