Throughout the 1920s and beyond, Stalin placed a high priority on foreign policy. He personally met with a range of Western visitors, including George Bernard Shaw and H. G. Wells, both of whom were impressed with him. Through the Communist International, Stalin's government exerted a strong influence over Marxist parties elsewhere in the world; initially, Stalin left the running of the organisation largely to Bukharin. At its 6th Congress in July 1928, Stalin informed delegates that the main threat to socialism came not from the right but from non-Marxist socialists and social democrats, whom he called "social fascists"; Stalin recognised that in many countries, the social democrats were the Marxist-Leninists' main rivals for working-class support. This preoccupation with opposing rival leftists concerned Bukharin, who regarded the growth of fascism and the far right across Europe as a far greater threat. After Bukharin's departure, Stalin placed the Communist International under the administration of Dmitry Manuilsky and Osip Piatnitsky.